QS es eS St—~— 
OE | EF 
INDEX. 
N.B.—The numbers refer to the paragraphs. 
A. 
ABERRATION, chromatic, 548, 549; 
spherical, 546, 547; avoided in the 
eye, 549. 
AssorprTion, nutritive, 171; in Verte- 
brata, through lacteals, 217; through 
blood-vessels, 218; in Invertebrata, 
225; in non-vascular animals, 225; 
in set a by iyisshaties, 
a from general s by veins, 
Abstinence, power of, 140, 141, 152. 
ACALEPHR, og. luminousness of, 395; 
(see Meduse 
jhalous Maltuses, 111, 113. 
747; of Entemostraca, 748. 
ir, eric, composition of, 300; 
need of in animals, 207; change ‘of, by 
respiration, 300—302; "effects of de- 
privation of, 297, 298, ’310, 338. 
—— bladder of Fishes, 324. 
— cells of Birds, 80, 326, 327. 
—— tubes and sacs of Insects, 320—322. 
Albinos, 545. 
Albumen, chemical composition of, 13, 
14; use of in blood, 240. 
Albuminous principles of food, 153; des- 
tination of, 158—16¢4. 
Aliment, definition of, 132 (see Food). 
Allantois, 760, 761. 
Ammonite, 111. 
Amphibia, 85, 87; circulation in, 287— 
289 ; (see Batrachia and Frog). 
Amphioxus, 53. 
Anabas, respiratory organs of, 318. 
ae of arteries, 262—265; of 
nerves, 428 
Anemone, Sea, 126, 127; reproduction 
of, 726, 739. 
Anenrism, 263. 
Animal Life, functions of, 6, 426, 427; 
neryous system of, 461. 
Animals, distinctive characters of, 6— 
12; dependent on Plants for scabart, 
144-147. 
Animalcules, structure of, 13, 136, 137 ; 
heat produced by, 404; movements of, 
577; reproduction of, 135, 725. 
ANNELIDA, general characters of, 104; 
circulation in, 294; respiration of, 
314; luminosity of, 396; nervous sys- 
tem of, 440; muscular motion of, 597; 
reproduction of, 727, 744. 
Annular ann of wrist, 641; of 
ancle, 64: 
Anobium, po of, 677. 
Ant-eaters, 186. 
Antenn@ of Insects, uses of, 498. 
Anthozoa, 126; development of, 736. 
Ant-lion, instinct of, 697. 
Aorta, 258; valves of, 273. 
Aphides, agamic reproduction of, 727, 
735, 746. 
Aplysia, nervous system of, 438. 
Aquatic animals, respiration in, 298. 
Aqueous humor, 536. 
ARACHNIDA, general characters of, 106; 
circulation in, 293; respiration in, 
323; development of, 751. 
Arachnoid membrane, 43. 
Area pellucida, 757. 
—— vasculosa, 758. 
Areas, comparative, of arteries, 247. 
Arenicola, 314, 
Areolar tissue, structure and properties 
of, 24—27. 
Argonaut, reproduction of, 753. 
Arm, bones and muscles of, 638—640. 
Arteries, 246; comparative areas of, 247; 
walls ‘of, 248; pressure of blood in, 
249; protection given to, 250; division 
of into capillaries, 251; general distri- 
bution of, in Man, 258, 259; in Bird, 
260, 261; peculiarities of distribution ef, 
262, 264, 265; flow of blood through, 
274—276; wounds of, 277. 
ARTICULATA, general structure of, 93— 
96; skeleton of, 597—600; nervous 
system of, 440—447; eyes of, 573—575/ 
Articulate sounds, 687—691. 
ee 
