INDEX 



Numbers in heavy type indicate illustrations 



Abderhalden and Heise, 139 

 Absorption cells of the earthworm, 



139 



Acetic acid from alcohol, 35 

 Acquired characteristics inherited, 



229 



Active immunity, 194 

 i Adaptation, property of protoplasm, 

 15; in lobster's appendages, 181; 

 and homology, 198 

 Adaptations against parasites, 191 

 Age and natural death, 67 

 Albumen cells of Hydra, 87 

 Allelomorphs in heredity, 217 

 Alternation of generations in hy- 



droids, 98; in ferns, 119 

 Alveolar theory of protoplasmic 



structure, 17 

 Amboceptors, in side-chain theory, 



197 



Amoeba proteus, 43-52; habitat, 44; 

 nucleus, 44; endoplasm and ecto- 

 plasm, 45; vacuoles, 45; move- 

 ment, 22, 46; metabolism, 46; 

 food- taking, 47; digestion, 47; 

 reproduction, 51; encystment, 52 

 Amoeboid movement, 22 

 Amphimixis, 227 

 Amphioxus, cleavage and gastrula- 



tion, 78 



Anabolism, constructive metabo- 

 lism, 12 



Analogy and homology, 161 

 Anasa tristis, pseudo-reduction, 213 

 Anatomy, subject matter, 2 

 Ancyrocanthus, 224 

 Animal associations, 181 

 Animal descent, 191 

 Animals and plants, 64 

 Anterior and posterior, 18 

 Antero-posterior differentiation, 130 

 Antheridia and archegonia, 123 

 Anti-bodies in immunity, 193 

 Antigens and anti-bodies, 195 

 Apical-cell growth, no 

 Appendages of the lobster, 163 

 Arboroid colony, 75 

 Archegonia and antheridia, 123 

 Archenteron in development, 78 



Arteries of the lobster, 172 



Arthrobranchs, 171 



Ascaris, chromosome-reduction, 210 



Asexual generation of the fern, 119 



Auditory organs of the lobster, 176 



Axes of symmetry, 18 



Axon and dendrites, 151 



B 



Bacteria, food of ciliates, 62 ; general 



structures and functions, 37-40 

 Basis of classification of animals, 160 

 Bateson, genetics, 214 

 Benham, earthworm structure, 143 

 Berzelius, catalytic forces, 34 

 Biedermann and Moritz, 169 

 Bilateral symmetry, 132 

 Binary fission, simple division, 13 

 Biological sciences, enumeration and 



scope, I 



Biology, subject matter, i 

 Biophor, in germ plasm, 206 

 Bladder worms, 188 

 Blastopore in development, 78 

 Blastula in metazoon cleavage, 77 

 Blood vascular system of earth- 

 worm, 141; of lobster, 169 

 Branchiostegites, 162 

 Boas (figure of Trichina), 188 

 Boerhaave, fermentation, 34 

 Botany, subject matter, i 

 Bourne (figure of earthworm), 92 

 Branchio-cardiac sinuses, 171 

 Brauer (figure of Hydra), 92 

 Buccal cavity and pharynx, 136 

 Buchano, alexine, 193 

 Buechner, extraction of xymase, 36 

 Buetschli, rejuvenescence by conju- 

 gation, 70 



Calciferous glands, 135; functions, 



137 



Cartilage, 19 



Castings of earthworms, 129 

 Catenpid colonies of protozoa, 74 

 Cell-division or mitosis, 204 

 Cells, protoplasmic units, 17; struc- 

 ture and history, 26 

 Cellulose in animals, 65 



243 



