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 

 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 

 Catenoid colonies of protozoa, 74 

 Cell-division or mitosis, 204 

 Cells, protoplasmic units, 17; struc- 

 ture and history, 26 

 Cellulose in animals, 65 



243 



