Corn Root Tip
"Lengthwise section through root-tip of Indian corn. w, root-cap; i, younger part of cap; z, dead cells…
Smilax
"Stem of "Smilax" (Myrsiphyllum). l, scale-like leaves; cl, cladophyll, or leaf-like branch, growing…
Diagram of the Body Plan
Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the…
Flower Parts
"The parts of the flower. cal, calyx; cor, corolla; st, stamens; p, pistil." -Bergen, 1896
Sweet Pea Flower
"Irregular corolla of sweet pea. A, side view; B, front view. s, standard; w, w, wings; k, keel." -Bergen,…
Stamen Parts
"Parts of a stamen. A, front; B, back. a, anther; c, connective; f, filament." -Bergen, 1896
Thistle Stamens
"Stamens of a thistle, with anthers united into a ring. a, united anthers; f, filaments, bearded on…
White Waterlily
"White water-lily. The inner petals and the stamens growing from the ovary." -Bergen, 1896
Stamens and Pistil
"Stamens and pistil of the grape, with a nectar gland, g, between each pair of stamens." -Bergen, 1896
Orange
"Cross-section of an orange. a, axis of fruit with dots showing cut-off ends of fibro-vascular bundles;…
Rockweed Section
"Transverse section of conceptacle of a rockweed (Fucus platycarpus). h, hairs; a, antheridia; o, oogonia."…
Honey Fungus
"A mushroom (Agaricus melleus). my, mycelium; c, c', c'', young 'buttons'; st, stipe or stalk; r, ring;…
Fungus Gills
"Portions of gills of a fungus (Agaricus). A, slightly magnified; B, one of the parts of A, more magnified.…
Spruce Ovule
"Longitudinal section through fertilized ovule of a spruce. p, pollen grains; t, pollen tubes; n neck…
Redcurrant Raceme
"Raceme of common red currant. p, peduncle; p', pedicel; br, bract." -Bergen, 1896
Yarrow
"Head of yarrow. A, top view; B, lengthwise section. re, receptacle; i, involucre; r, ray-flowers; d,…
Grass Inflorescence
"Diagram of inflorescence of a grass. g, sterile glumes; P1, a flowering glume; P2, a scaly bract (palea);…
Fescue Grass
"Fescue-grass (Festuca pratensis). A, spikelet; B, a flower, the lodicules in front and the palea behind;…
Sedge
"Inflorescence, flower, and seed, of a sedge. (Great Bulrush, Scirpus lacustris.) A, magnified flower,…
Common Sweet Flag
"Acorus calamus. A, spadix; B, a single flower, enlarged; C, diagram of flower, enlarged." -Bergen,…
Iris
"Iris. I, flower; II, seed, longitudinal section; III, flower with outer segments of perianth removed;…
Iris
"Iris. I, flower, longitudinal section, ov., ovary; II, diagram, showing stigmas opposite the stamens;…
Alder Flowers
"Alnus glutinosa. A, a flowering twig; s, staminate catkins; p, pistillate catkins; B, a group of staminate…
Flowering Spurge
"Euphorbia corollata. A, flower-cluster with involucre, the whole appearing like a single flower; B,…
Heartsease
"Viola tricolor. A, stamens and pistil; B, pistil with stamens removed; C, pod split open." -Bergen,…
Begonia
"Begonia Flowers. A, staminate flower; B, pistillate flower; C, twisted stigmas, enlarged; D, cross-section…
Umbelliferae
"Flower and fruit of Umbelliferae. A, flower of Foeniculum; B, fruit of Heracleum; C, fruit of Heracleum,…
Milkweed
"Flower of Asclepias Cornuti. A, entire flower; B, vertical section; C, diagram; D, details of pollen-masses…
Plantain Flowers
"Flowers of plantain (Plantago), enlarged. A, earlier stage, pistil mature, stamens not yet appearing…
Cornflower
"Bachelor's Button. I, vertical section of the receptacle; II, style and forked stigma; III, corolla,…
Cornflower
"Bachelor's Button. I, a tubular flower; anth, the united anthers; II, fruit; III, fruit, vertical section;…
Yarrow
"Flower-cluster of yarrow (Achillea Millefolium). A, head seen from above; B, longitudinal section;…
Circle Parts
A circle with labels for radius, diameter, and circumference. The visual will help to remember what…
Cylinder Parts
"Explanation of the cylinder. a, altitude; c, circumference of base, or perimeter; d, diameter; s, lateral…
Castle Parts
"Details of a castle: 1. Fortified approach 2. Drawbridge 3. Moat 4. Donjon or keep 5. Towers flanking…
Gathering Sap to make Maple Sugar
"The sugar maple tree resembles the sycamore, and abounds in the northern parts of the United States,…
Hemp Plant
"Hemp adapts itself to diversities of climate, and is cultivated equally under the burning sun of the…
Construction Of A Line Divided In Equal Parts
An illustration showing the construction used to divide a line AB into two equal parts; and to erect…
Construction Of A Divided Angle
An illustration showing the construction used to divide an angle into two equal parts. "With C as a…
Construction Of A Divided Angle
An illustration showing the construction used to divide an angle into two equal parts when the lines…
Divide A Line Proportionately
An illustration showing the construction used to divide the line AB in the same proportion of parts…
Square Constructed Upon A Given Line
An illustration showing how to construct a square upon a given line. "With AB as radius and A and B…
Pulley
"In a system of pulleys (figs. 3,4) in which the same string passes round any number of pulleys, and…
Construction Of A Cyma
An illustration showing how to construct a cyma, or two circle arcs that will tangent themselves, and…
Construction Of A Talon
An illustration showing how to construct a talon, or two circle arcs that will tangent themselves, and…
Construction Of A Circle Arc
An illustration showing how to construct a circle arc without recourse to its center, but its chord…
Pumpkin
"A climbing plant and its fruit, of the genus Cucurbita. The pumpkin is originally from India, but is…
Construction Of An Octagon
An illustration showing how to construct an octagon on a given line. "Prolong AB to C. With B as center…
Construction Of A Regular Polygon On A Line
An illustration showing how to construct a regular polygon on a given line without resort to its center.…
Quince Fruit
The quince-tree, which is supposed to be a native of Western Asia, is now cultivated throughout Europe,…
Construction Of An Isometric Ellipse
An illustration showing how to construct an isometric ellipse by compass and six circle arcs. "Divide…