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Each scale of the pine cone is a whole pistillate flower. (Gray, 1858).

Scale

Each scale of the pine cone is a whole pistillate flower. (Gray, 1858).

"Power is applied to the head of the screw. Each time the screw is turned into the nut, it advances the distance between two of the threads and compresses to that extent any fixed object against which it is directed." —Quackenbos 1859

Screw and Nut

"Power is applied to the head of the screw. Each time the screw is turned into the nut, it advances…

"In this, the screw is fixed, while the nut, N, by being turned by the lever, L, from right to left, will advance down the screw." -Comstock 1850

Screw Fixed Screw

"In this, the screw is fixed, while the nut, N, by being turned by the lever, L, from right to left,…

"A screw is a cylinder, generally made of wood or metal, with a spiral ridge (the thread) winding about its circumfrence. The thread works in a nut, withihn which there is a corresponding spiral groove to receive the thread." -Avery 1895

Screw press

"A screw is a cylinder, generally made of wood or metal, with a spiral ridge (the thread) winding about…

"Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch proper; e, nut for the screw; f, weighted lever by which the screw is made to exert its power upon the punch d." -Whitney, 1911

Screw Punch

"Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch…

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock; a screw-plate." -Whitney, 1911

Screw Stock

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock;…

A number of screws, all used in carriage-making and carpentry. "A, B, C, D, and E are special forms of wood-screws in common use." —Whitney, 1889

Collection of Screws Used in Carriage-Making and Carpentry

A number of screws, all used in carriage-making and carpentry. "A, B, C, D, and E are special forms…

The outer coat is sometimes close and even, and fitted to the kernel, as in this Morning-glory, (Gray, 1858).

Seed-coat

The outer coat is sometimes close and even, and fitted to the kernel, as in this Morning-glory, (Gray,…

The outer coat is extended into a thin border or wing as in this Trumpet Creeper, (Gray, 1858).

Seed-coat

The outer coat is extended into a thin border or wing as in this Trumpet Creeper, (Gray, 1858).

The outer seed-coat of the milkweed is furnished with a tuft of long hairs, (Gray, 1858).

Seed-coat

The outer seed-coat of the milkweed is furnished with a tuft of long hairs, (Gray, 1858).

Also known as Hicoria laciniosa. The branch of the Shellbark Hickory tree, native to the midwestern United States.

Branch of Shellbark Hickory

Also known as Hicoria laciniosa. The branch of the Shellbark Hickory tree, native to the midwestern…

A silique is a pod of the Cress family.

silique

A silique is a pod of the Cress family.

"A double nut which has right-hand and left-hand threads for attaching the joint-ends of rods or tubes; a union. a, a1, rods or pipes to be joined, a having a right-hand screw and a1 a left-hand screw, to which screws the right and left sleeve-nut b is fitted." -Whitney, 1889

Sleeve Nut

"A double nut which has right-hand and left-hand threads for attaching the joint-ends of rods or tubes;…

This is a young, forming strawberry, divided lengthwise,(Gray, 1858).

Strawberry

This is a young, forming strawberry, divided lengthwise,(Gray, 1858).

Embryo of Sugar Maple,(Gray, 1858).

Sugar Maple Embryo

Embryo of Sugar Maple,(Gray, 1858).

Also known as Hicoria minima. The branch of a Swamp Hickory tree, which produces pear-shaped nuts.

Branch of Swamp Hickory

Also known as Hicoria minima. The branch of a Swamp Hickory tree, which produces pear-shaped nuts.

The totem or emblem of the Sioux, a Native American tribe has a squirrel on top of a nut.

Sioux Totem

The totem or emblem of the Sioux, a Native American tribe has a squirrel on top of a nut.

" Almonds come from Spain and Italy, but they grow spontaneously in many other warm countries. There are two kinds of almonds, the sweet and the bitter, only differing from each other in the flavor of the nut. Valentia almonds are sweet and large; Italian not either so large or sweet." -Lupton

Almond Tree

" Almonds come from Spain and Italy, but they grow spontaneously in many other warm countries. There…

Walnut, a genus comprising seven or eight species of beautiful trees of the Juglandaceae order.

Walnut

Walnut, a genus comprising seven or eight species of beautiful trees of the Juglandaceae order.

This is tree is native to North America, known for its dark wood and edible nuts.

Black Walnut

This is tree is native to North America, known for its dark wood and edible nuts.

Also known as Juglans cinerea. A species of walnut native to the eastern United States and southeast Canada.

Branch of White Walnut Tree

Also known as Juglans cinerea. A species of walnut native to the eastern United States and southeast…