Re gen er a' tion, the power to grow new parts or organs.
Re' gions, the principal divisions of the body, head, thorax, and abdomen.
Res pi ra' tion, the passage of oxygen into the tissues of a living organism and of carbon dioxide out of them. These gases can pass through any thin, moist, organic membrane. When such a membrane separates two fluids which differ in the amount of oxygen they contain, oxygen passes to thefluid containing the smaller amount. The same is true of carbon dioxide. Respiration is believed to occur in all living organisms.
Ro' dent, mammals with curved self-sharpening incisor teeth, order including mice, rats, squirrels, rabbits, etc.
Ros' trum, a beak-like projection or snout.
Ru' mi nant, chewing the cud.
Sac, a cavity or pouch.
Sa' crum, a composite bone formed by the union of vertebræ in the region of hips.
Scap' u la, the shoulder-blade.
Sep' tum(pl.sep' ta), a wall or partition between two cavities.
Se' ta(pl.se' tae), small bristles or stiff hairs.
Sex' u al, pertaining to sex.
Si' nus ve no' sus, an enlargement of the termination of the large veins.
Si' phon, a tube-like organ.
So' mites, the serial segments or rings composing the bodies of many animals.
Spe' ci es, a word used in classification to designate a group of animals differing only in minor details.
Sper' ma ry, the organ in which sperm cells are developed.
Sperm cells, the small, often motile, reproductive cell, which fuses with the egg cell.
Spic' ules, tiny needles of mineral substance found in the walls of many animals, notably sponges.
Spi' ra cle, an opening into the tracheal breathing organs of insects.
Spire, the coiled portion of a gasteropod shell.
Spore, a cell capable of developing into a new organism.
Sternum, a bone extending along the lower middle line of the chest region.
Stom' ach, the region of the alimentary canal especially adapted to digest food.
Stom' ach-in tes' tine, a region of the alimentary canal adapted to both digest and absorb food.
Sub cla' vi an, situated beneath the clavicle.
Su' ture, the junction of two contiguous structures.
Swim' mer ets, the abdominal appendages in crustaceans.
Sym bi o' sis, an association of two animals which is mutually helpful.
Tar' sal, one of the bones of the tarsus or ankle.
Tar' sus, (1) the ankle; (2) the fifth or terminal joint in an insect's leg.
Ten' ta cles, special organs for touch; also used sometimes for other purposes.
Terrifying attitudes, protective attitudes assumed by some animals.
Tho' rax, the region of the body between the head and abdomen.
Tib' i a, (1) the shin-bone; (2) the fourth joint of an insect's leg.
Tooth, (1) an organ used in mastication; (2) a tooth-like projection.
Tra' che a, a tube which carries air either to the respiratory organ or to the tissues.
Trunk, the portion of the body between head and tail.
Tu' ber cle, a knob-like projection.
Ul' na, that bone of the forearm which is on the same side as the little finger.
Um' bo(pl.umbones), an elevation near the anterior end of a bivalve shell.
Un' gu lates, hoofed mammals.
U re' ter, a duct connecting the kidney with the urinary bladder.
U' ro style, a long bone forming the hinder extremity of the vertebral column of tailless amphibia.
Vac' u oles, small, clear spots in cells, filled with a watery fluid.SeeFood-vacuolesandContracting vacuoles.
Valve, (1) a membranous fold which allows the blood, or other fluids, to flow in only one direction; (2) one of the two parts of the shell of a bivalve.
Vein, (1) a blood-vessel carrying blood toward the heart; (2) one of the tubular thickenings of an insect's wing.
Ve' na ca' va, a large vein emptying into the right auricle of the heart.
Ven' tral, situated on the under surface.
Ven' tri cle, any cavity of a hollow organ, as of the brain or heart.
Ver' mes, the worms, a poorly defined group of animals, showing bilateral symmetry but without segmented appendages.
Ver' te bra, one of the bones of the spinal column.
Ver' te brates, animals having a backbone.
Vi bris' sæ, long hairs on the face.
Vis' ce ra(pl. ofviscus), the organs of one of the great cavities of the body (the abdomen, the thorax, or the cranium), usually meaning those of the abdomen.
Vi va' ri um, a cage in which living animals are kept.
Warning colors, bright colors which render an animal free from attack.
Whorl, a single coil in the spire of a gasteropod shell.
Yolk, food material of an egg.
[1]This study is intended for an alternative study in case it is not practicable to use the studies of living insects. With slight adaptation it can be made useful for any insect, either preserved or living.
[1]This study is intended for an alternative study in case it is not practicable to use the studies of living insects. With slight adaptation it can be made useful for any insect, either preserved or living.
[2]Note.—This passage of fluids through membranes is known asosmosis.
[2]Note.—This passage of fluids through membranes is known asosmosis.
[3]This and the following questions are to be answered for each specimen. The answers may be tabulated if desired.
[3]This and the following questions are to be answered for each specimen. The answers may be tabulated if desired.
Transcriber's correctionsp. 5: [a.] A cockroach, seen from above.p. 116: the slit inclosed between[beween] the vocal cords, openingp. 140: or color, if there are any.[?]p. 146: [E.] Studies of Mammalsp. 162: and zoölogical[zoological] gardens.p. 165: wears away properly of itself, but the shod[shed] hoof needs