ClipArt ETC
"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 14, split chromosomes of 13 aligned at the equator ready for the longitudinal halves of each to be drawn apart to opposite poles." -Stevens, 1916

Division of Grandmother Cell Stage 14

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic.…

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 15, separation of the longitudinal halves." -Stevens, 1916

Division of Grandmother Cell Stage 15

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic.…

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 16, formation of granddaughter nuclei, or nuclei of the spores." -Stevens, 1916

Division of Grandmother Cell Stage 16

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. A, beginning of ovule at o." -Stevens, 1916

Megaspore Formation Stage 1

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. B, nu, nucellus" -Stevens, 1916

Megaspore Formation Stage 2

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. Ca, nu, nucellus, a, archesporium; in, forward growth of tissue to form the integument; Cb, nu, nucellus; in, integument." -Stevens, 1916

Megaspore Formation Stage 3

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. D, more highly magnified drawing of o in A showing archesporial cell at a." -Stevens, 1916

Megaspore Formation Stage 4

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. E, a, archesporial cell enlarged and ready for division; nu, tissue of the nucellus." -Stevens, 1916

Megaspore Formation Stage 5

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. F, a, archesporial cell dividing, nu, nucellus." -Stevens, 1916

Megaspore Formation Stage 6

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. G, row of four megaspores descended from the archesporial cell, only the upper one, m, functional, the other soon disintegrate." -Stevens, 1916

Megaspore Formation Stage 7

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. H, megaspore, m, enlarging, the others disappearing." -Stevens, 1916

Megaspore Formation Stage 8

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. I, nucleus of the megaspore, divided into two, md." -Stevens, 1916

Megaspore Formation Stage 9

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. J, continued nuclear division has resulted in eight, namely, three antipodal nuclei, an, at the upper end of the megaspore cavity, two polar nuclei, l, in process of fusion, egg cell, eg, two synergids, s, s." -Stevens, 1916

Megaspore Formation Stage 10

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. K, showing only the lower half of the megaspore or embryo-sac cavity, with pollen tube, pt, and male nucleus, mn, fusing with egg cell, eg, and second male nucleus, mn2, uniting with primary endosperm nucleus, pe; s, synergid." -Stevens, 1916

Megaspore Formation Stage 11

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. L, later stage in the embryo-sac, an, antipodal cells, em, beginning of the embryo by division of fertilized egg cell; five dividing nuclei descended from primary endosperm nucleus." -Stevens, 1916

Megaspore Formation Stage 12

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

"Diagram to show results of hybridization, with reference to dominant and recessive characters to the F3 generation." -Stevens, 1916

Hybridization

"Diagram to show results of hybridization, with reference to dominant and recessive characters to the…

"Diagram showing possible combination of two contrasting characters during self-fertilization of a hybrid. A, row of sperm cells, B, row of egg cells, C, row of fertilized egg cells." -Stevens, 1916

Hybrid Self-Fertilization

"Diagram showing possible combination of two contrasting characters during self-fertilization of a hybrid.…

Hands cutting something with a razor.

Razor

Hands cutting something with a razor.

"Showing the planes in which sections are cut transversely." -Stevens, 1916

Cutting Sections Transversely

"Showing the planes in which sections are cut transversely." -Stevens, 1916

"Showing the planes in which sections are cut longitudinal radially" -Stevens, 1916

Cutting Radially

"Showing the planes in which sections are cut longitudinal radially" -Stevens, 1916

"Showing the planes in which sections are cut longitudinal tangentially." -Stevens, 1916

Cutting Tangentially

"Showing the planes in which sections are cut longitudinal tangentially." -Stevens, 1916

"Showing how to trim a block for cutting longitudinal sections." -Stevens, 1916

Trimming

"Showing how to trim a block for cutting longitudinal sections." -Stevens, 1916

"Simple microtome for clamping to table. P, P, plate glass ways for the section knife; S, milled-head for clamping the object; M, micrometer milled-head for turning the screw that raises the object as the sections are cur; C, milled-head for clamping the microtome to the table." -Stevens, 1916

Microtome

"Simple microtome for clamping to table. P, P, plate glass ways for the section knife; S, milled-head…

"Showing the manner of holding the knife blade on the glass ways, and, by the arrow, the direction of sliding he knife while cutting the sections." -Stevens, 1916

Microtome and Razor

"Showing the manner of holding the knife blade on the glass ways, and, by the arrow, the direction of…

"A sliding microtome of simple construction, adapted to cutting all kinds of sections." -Stevens, 1916

Sliding Microtome

"A sliding microtome of simple construction, adapted to cutting all kinds of sections." -Stevens, 1916

"Showing the manner of honing the section knife or razor." -Stevens, 1916

Cutting Plant Sections

"Showing the manner of honing the section knife or razor." -Stevens, 1916

"Illustrating how the section knife or razor is drawn across the strop." -Stevens, 1916

Cutting Plant Sections

"Illustrating how the section knife or razor is drawn across the strop." -Stevens, 1916

"Turn table for cementing coverglasses to slides. For use where the mounting medium is glycerine or glycerine jelly." -Stevens, 1916

Mounting Plant Sections

"Turn table for cementing coverglasses to slides. For use where the mounting medium is glycerine or…

"An epiphytic ant plant (Myrmecodia pentasperma) of the Bismarck Archipelago. The large pseudobulb is filled with cavities which are nearly always tenanted by ant." -National Geographic, 1916

Ant Plant

"An epiphytic ant plant (Myrmecodia pentasperma) of the Bismarck Archipelago. The large pseudobulb is…

A decorative doodad or divider of a plant in a vase.

Plant Doodad

A decorative doodad or divider of a plant in a vase.

Of the Arum family, the skunk cabbage or Symplocarpus foetidus.

S. Foetidus

Of the Arum family, the skunk cabbage or Symplocarpus foetidus.

Of the Arum family, the sweet flag or Acorus calamus.

A. Calamus

Of the Arum family, the sweet flag or Acorus calamus.

Of the amaranth family (Amarantaceae): left, pigweed (Amarantus retroflexus); right, Tumble Weed (Amarantus graecizans).

Pigweed and Tumble Weed

Of the amaranth family (Amarantaceae): left, pigweed (Amarantus retroflexus); right, Tumble Weed (Amarantus…

Of the purslane family (Portulacaceae): left, the Purslane (Portulaca oleracea); right, spring beauty (Claytonia Virginica).

Purslane and Spring Beauty

Of the purslane family (Portulacaceae): left, the Purslane (Portulaca oleracea); right, spring beauty…

Of the pink family (Caryophyllaceae): left, Deptford pink (Dianthus Armeria); right, maiden pink (Dianthus deltoides).

Deptford Pink and Maiden Pink

Of the pink family (Caryophyllaceae): left, Deptford pink (Dianthus Armeria); right, maiden pink (Dianthus…

Of the pink family (Caryophyllaceae): left, the bladder campion (Silene latifolia); right, starry campion (Silene stellata).

Bladder Campion and Starry Campion

Of the pink family (Caryophyllaceae): left, the bladder campion (Silene latifolia); right, starry campion…

Of the pink family (Caryophyllaceae): left, chickweed (Stellaria media); middle, mountain sandwort (Arenaria Groenlandiea); right, long-leaved stitchwort (Stellaria longifolia).

Chickweed, Mountain Sandwort, Long-Leaved Stitchwort

Of the pink family (Caryophyllaceae): left, chickweed (Stellaria media); middle, mountain sandwort (Arenaria…

Of the water-lily family (Nymphaeceae), the sand spurry or Spergularia rubra.

Sand Spurry

Of the water-lily family (Nymphaeceae), the sand spurry or Spergularia rubra.

Of the crowfoot family (Ranunculaceae), the tall meadow rue or Thalictrum polygamum.

Tall Meadow Rue

Of the crowfoot family (Ranunculaceae), the tall meadow rue or Thalictrum polygamum.

Of the crowfoot family (Ranunculaceae), the swamp buttercup or Ranunculus septentrionalis. The smaller image is of the leaf of the early buttercup or Ranunculus fascicularis.

Swamp Buttercup

Of the crowfoot family (Ranunculaceae), the swamp buttercup or Ranunculus septentrionalis. The smaller…

Of the crowfoot family (Ranunculaceae), the tall buttercup or Ranunculus acris.

Tall Buttercup

Of the crowfoot family (Ranunculaceae), the tall buttercup or Ranunculus acris.

Of the crowfoot family (Ranunculaceae), the columbine or Aquilegia Canadensis.

Columbine

Of the crowfoot family (Ranunculaceae), the columbine or Aquilegia Canadensis.

Of the crowfoot family (Ranunculaceae): left, goldthread (Coptis trifolia); right, monkshood (Aconitum uncinatum).

Goldthread and Monkshood

Of the crowfoot family (Ranunculaceae): left, goldthread (Coptis trifolia); right, monkshood (Aconitum…

Of the crowfoot family (Ranunculaceae): large image: the red baneberry or Actaea rubra; bottom right: fruit of the white baneberry or Actaea alba.

Red Baneberry

Of the crowfoot family (Ranunculaceae): large image: the red baneberry or Actaea rubra; bottom right:…

Of the barberry family (Berberidaceae), the twinleaf or Jeffersonia diphylla.

Twinleaf

Of the barberry family (Berberidaceae), the twinleaf or Jeffersonia diphylla.

Of the barberry family (Berberidaceae), the may apple or Podophyllum peltatum.

May Apple

Of the barberry family (Berberidaceae), the may apple or Podophyllum peltatum.

Of the poppy family (Papaveraceae): left, bloodroot (Sanguinaria Canadensis); right, celandine poppy (Stylophorum diphyllum).

Bloodroot and Celandine Poppy

Of the poppy family (Papaveraceae): left, bloodroot (Sanguinaria Canadensis); right, celandine poppy…

Of the poppy family (Papaveraceae), the celandine or Chelidonium majus.

Celandine

Of the poppy family (Papaveraceae), the celandine or Chelidonium majus.

Of the poppy family (Papaveraceae), the prickly poppy or Argemone Mexicana.

Prickly Poppy

Of the poppy family (Papaveraceae), the prickly poppy or Argemone Mexicana.

Of the fumitory family (Fumariaceae), the climbing fumitory or Adlumia fungosa.

Climbing Fumitory

Of the fumitory family (Fumariaceae), the climbing fumitory or Adlumia fungosa.

Of the fumitory family (Fumariaceae), the Dutchman's breeches or Dicentra Cucullaria.

Dutchman's Breeches

Of the fumitory family (Fumariaceae), the Dutchman's breeches or Dicentra Cucullaria.

Of the fumitory family (Fumariaceae): left, pale corydalis (Corydalis sempervirens); right, squirrel corn (Dicentra Canadensis).

Pale Corydalis and Squirrel Corn

Of the fumitory family (Fumariaceae): left, pale corydalis (Corydalis sempervirens); right, squirrel…

Of the fumitory family (Fumariaceae), the fumitory or Fumaria officinalis.

Fumitory

Of the fumitory family (Fumariaceae), the fumitory or Fumaria officinalis.

Of the mustard family (Cruciferae), the toothwort of Dentaria diphylla.

Toothwort

Of the mustard family (Cruciferae), the toothwort of Dentaria diphylla.

Of the mustard family (Cruciferae), the spring cress or Cardamine bulbosa.

Spring Cress

Of the mustard family (Cruciferae), the spring cress or Cardamine bulbosa.

Of the mustard family (Cruciferae), the hairy rock cress or Arabis hirsuta.

Hairy Rock Cress

Of the mustard family (Cruciferae), the hairy rock cress or Arabis hirsuta.

Of the mustard family (Cruciferae), the small bitter cress or Cardamine hirsuta.

Small Bitter Cress

Of the mustard family (Cruciferae), the small bitter cress or Cardamine hirsuta.

Of the mustard family (Cruciferae): left, hedge mustard (Sisymbrium officinale); right, whitlow-grass (Draba verna).

Hedge Mustard and Whitlow-Grass

Of the mustard family (Cruciferae): left, hedge mustard (Sisymbrium officinale); right, whitlow-grass…

Of the mustard family (Cruciferae), the yellow rocket of Barbarea vulgaris.

Yellow Rocket

Of the mustard family (Cruciferae), the yellow rocket of Barbarea vulgaris.

Of the mustard family (Cruciferae), the black mustard or Brassica nigra.

Black Mustard

Of the mustard family (Cruciferae), the black mustard or Brassica nigra.