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Base of a leaf and contained sporocarp filled with microspores cut across.

Isoetes

Base of a leaf and contained sporocarp filled with microspores cut across.

Base of a leaf and contained sporocarp filled with microspores cut lengthwise.

Isoetes

Base of a leaf and contained sporocarp filled with microspores cut lengthwise.

Top of a leaf, cut across; it consists of a single layer of cells.

Leaf

Top of a leaf, cut across; it consists of a single layer of cells.

A grape-vine leaf gall-louse. The insect forms galls on the under side of the grape-vine leaves, and although they appear to do comparatively little injury to the vine, they are extremely interesting to vine-growers.

Fitch

A grape-vine leaf gall-louse. The insect forms galls on the under side of the grape-vine leaves, and…

Cysts on a living rose leaf.

Cysts

Cysts on a living rose leaf.

Cysts on a living rose leaf.

Cysts

Cysts on a living rose leaf.

Cysts on a living rose leaf, sectional view.

Cysts

Cysts on a living rose leaf, sectional view.

Spores and cysts on a living rose leaf.

Cysts

Spores and cysts on a living rose leaf.

Hyphomycetes on a clover.

Clover

Hyphomycetes on a clover.

Hyphomycetes on a tuft.

Clover

Hyphomycetes on a tuft.

Hyphomycetes on a clover, the threads and spores enlarged.

Clover

Hyphomycetes on a clover, the threads and spores enlarged.

Cottony maple scale, Pulminaria innumerabilis, showing, at a, the female on a leaf and, at b, same on a twig.

Maple Scale

Cottony maple scale, Pulminaria innumerabilis, showing, at a, the female on a leaf and, at b, same on…

Galls of Phylloxera on grape-leaf.

Phylloxera Galls

Galls of Phylloxera on grape-leaf.

Cock's-comb gall on elm, Colopha ulmicola- an elm-leaf showing galls.

Coxcomb

Cock's-comb gall on elm, Colopha ulmicola- an elm-leaf showing galls.

Languria Mozardi, egg.

Clover Stem Borer

Languria Mozardi, egg.

Languria Mozardi, larva in clover stem.

Clover Stem Borer

Languria Mozardi, larva in clover stem.

Languria Mozardi, larva.

Clover Stem Borer

Languria Mozardi, larva.

Languria Mozardi, pupa.

Clover Stem Borer

Languria Mozardi, pupa.

Languria Mozardi, adult.

Clover Stem Borer

Languria Mozardi, adult.

Elm-leaf beetle, Galeruca xanthomelaena; a, egg patches on leaves; b, larva feeding; c, adult feeding.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; a, egg patches on leaves; b, larva feeding; c, adult feeding.

Elm-leaf beetle, Galeruca xanthomelaena; egg mass.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; egg mass.

Elm-leaf beetle, Galeruca xanthomelaena; surface of the egg.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; surface of the egg.

Elm-leaf beetle, Galeruca xanthomelaena; larva.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; larva.

Elm-leaf beetle, Galeruca xanthomelaena; detail of larva.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; detail of larva.

Elm-leaf beetle, Galeruca xanthomelaena; detail of larva.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; detail of larva.

Elm-leaf beetle, Galeruca xanthomelaena; pupa.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; pupa.

Elm-leaf beetle, Galeruca xanthomelaena; beetle.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; beetle.

Elm-leaf beetle, Galeruca xanthomelaena; surface of elytra.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; surface of elytra.

Clover-leaf beetle, Phytonomus punctatus species; egg.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; egg.

Clover-leaf beetle, Phytonomus punctatus species; b, larva feeding; i, beetle.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; b, larva feeding; i, beetle.

Clover-leaf beetle, Phytonomus punctatus species; very young larva.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; very young larva.

Clover-leaf beetle, Phytonomus punctatus species; cocoon.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; cocoon.

Clover-leaf beetle, Phytonomus punctatus species; net-like character of cocoon.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; net-like character of cocoon.

Clover-leaf beetle, Phytonomus punctatus species; pupa.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; pupa.

Clover-leaf beetle, Phytonomus punctatus species; beetle.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; beetle.

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Beetle

Clover-leaf beetle, Phytonomus punctatus species; structural detail.

Diseased larva of clover-leaf beetle.

Clover-Leaf Beetle Larva

Diseased larva of clover-leaf beetle.

Milk-weed butterfly, Danais archippus species; egg on a leaf.

Butterfly

Milk-weed butterfly, Danais archippus species; egg on a leaf.

Grape-leaf on which larva of Harrisina americana are feeding.

Larva

Grape-leaf on which larva of Harrisina americana are feeding.

The wheat-head army-worm; eggs under a leaf sheath.

Armyworm

The wheat-head army-worm; eggs under a leaf sheath.

Teras minuta species; case made on apple-leaf.

Moth

Teras minuta species; case made on apple-leaf.

Cranberry leaf with eggs of Rhopobota species, and a spray spun up at tip by the larva.

Cranberry

Cranberry leaf with eggs of Rhopobota species, and a spray spun up at tip by the larva.

The Hessian-fly of the Cecidomyia destructor species; On the left, a healthy stalk of wheat, and on the right one infested at h by Hessian-fly, showing the galls. a, egg; b, larva; c, flaxseed; d, pupa; e, fly ovipositing on leaf; f, female; g, male Hessian-fly; i, the parasite, Merisus destructor species.

Hessian Fly

The Hessian-fly of the Cecidomyia destructor species; On the left, a healthy stalk of wheat, and on…

Apanteles species. Little mass of cocoonson leaf, replacing an infested larva.

Apanteles

Apanteles species. Little mass of cocoonson leaf, replacing an infested larva.

A leaf-cutter bee, Megachile species. Adult with wings at rest.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Adult with wings at rest.

A leaf-cutter bee, Megachile species. Adult with wings expanded.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Adult with wings expanded.

A leaf-cutter bee, Megachile species. Bee is at work on a rose-leaf.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Bee is at work on a rose-leaf.

A leaf-cutter bee, Megachile species. Segments of leaves cut from leaf-cutter bee.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Segments of leaves cut from leaf-cutter bee.

A leaf-cutter bee, Megachile species. Leaves cut from leaf-cutter bee in a burrow in a dead branch.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Leaves cut from leaf-cutter bee in a burrow in a dead branch.

Camelia sinensis is the tea plant, the plant species whose leaves and leaf buds are used to produce tea.

Tea

Camelia sinensis is the tea plant, the plant species whose leaves and leaf buds are used to produce…

"One sporophyll with empty sporangia."—Finley, 1917

Sporophyll

"One sporophyll with empty sporangia."—Finley, 1917

"Gold leaf electroscope; it consists of two strips of gold foil suspended from a brass rod within a glass jar. Used to detect the presence and sign of an electric charge." -Hawkins, 1917

Gold Leaf Electroscope

"Gold leaf electroscope; it consists of two strips of gold foil suspended from a brass rod within a…

"Distrbution of electrification on a charged hollow sphere. If an insulated conductor d be inserted through the opening in the sphere and brought in contact with the interior surface and afterwards carefully removed, it will be found, by testing with the gold leaf electroscope, tat it has recieved no charge. If touched to the outside, however, the conductor will recieve part of the charge." -Hawkins, 1917

Distribution of Charge

"Distrbution of electrification on a charged hollow sphere. If an insulated conductor d be inserted…

"One of the simplest instruments of this kind consists of a metallic needle, terminated at each end by a light pith-ball, which is covered with gold leaf, and supported horizontally at its centre by a fine point.." -Comstock 1850

Electroscope

"One of the simplest instruments of this kind consists of a metallic needle, terminated at each end…

Geometric pattern for translation and rotation exercises.

Geometric Block Pattern 39

Geometric pattern for translation and rotation exercises.

The epiglottis is a cartilaginous lid for the larynx. It is leaf-shaped, situated behind the base of the tongue, and attached by its apex to the posterior surface of the thyroid cartilage, just below the median notch.

The Epiglottis

The epiglottis is a cartilaginous lid for the larynx. It is leaf-shaped, situated behind the base of…