INDEX 



Numbers in heavy type indicate illustrations 



A 



Abderhalden and Heise, 142 

 Absorption cells of the earthworm, 



142 



Acetic acid from alcohol, 38 

 Acquired characteristics inherited, 



234 



Active immunity, 198 



Adaptation, property of protoplasm, 

 15; in lobster's appendages, 185; 

 and homology, 203 



Adaptations against parasites, 195 



Age and natural death, 68 



Albumen cells of Hydra, 89 



Allelomorphs in heredity, 222 



Alternation of generations in hy- 

 droids, 100; in ferns, 122 



Alveolar theory of protoplasmic 

 structure, 17 



Amboceptors, in side-chain theory, 

 201 



Amino-acid, 40 



Amoeba proteus, 44-53; habitat, 45; 

 nucleus, 45; endoplasm and ecto- 

 plasm, 46; vacuoles, 46; move- 

 ment, 22, 47; metabolism, 47; 

 food-taking, 48; digestion, 48, 

 reproduction, 52; encystment, 53 



Amoeboid movement, 22 



Amphimixis, 232 



Amphioxus, cleavage and gastrula- 

 tion, 80 



Amylase, 40 



Anabolism, constructive metabo- 

 lism, 12 



Analogy and homology, 165 



Anasa tristis, pseudo-reduction, 218 



Anatomy, subject matter, 2 



Ancyrocanthus, 226 



Animal associations, 193 



Animal descent, 204 



Animals and plants, 66 



Anterior and posterior, 18 



Antero-posterior differentiation, 133 



Antheridia and archegonia, 126 



Anti-bodies in immunity, 199 



Antigens and anti-bodies, 199 



Apical-cell growth, 112 



Appendages of the lobster, 168 



Arboroid colony, 77 



Archegonia and antheridia, 126 



Archenteron in development, 80 



Archesporium, 123 

 Arteries of the lobster, 176 

 Arthrobranchs, 175 

 Ascaris, chromosome-reduction, 215 

 Asexual generation of the fern, 122 

 Auditory organs of the lobster, 180 

 Axes of symmetry, 18 

 Axon and dendrites, 153 



B 



Bacteria, food of ciliates, 63; general 



structures and functions, 34-37 

 Basal-body, 54 



Basis of classification of animals, 165 

 Bateson, genetics, 219 

 Benham, earthworm structure, 147 

 Berzelius, catalytic forces, 39 

 Biedermann and Moritz, 173 

 Bilateral symmetry, 135 

 Binary fission, simple division, 13 

 Biological sciences, enumeration and 



scope, I 



Biology, subject matter, I 

 Biophor, in germ plasm, 211 

 Bladder worms, 192 

 Blastophore, 158 

 Blastopore in development, 80 

 Blastula in metazoon cleavage, 79 

 Blood vascular system of earth- 

 worm, 145; of lobster, 173 

 Branchiostegites, 166 

 Boas (figure of Trichina), 192 

 Botany, subject matter, I 

 Bourne (figure of earthworm), 94 

 Branchio-cardiac sinuses, 175 

 Brauer (figure of Hydra), 94 

 Buccal cavity and pharynx, 139 

 Buchano, alexine, 197 

 Buechner, extraction of xymase, 38 

 Buetschli, rejuvenescence by conju- 

 gation, 72 



Calciferbus glands, 138; functions, 



140 



Cartilage, 19 



Castings of earthworms, 132 

 Catenoid colonies of protozoa, 76 

 Cell-division or mitosis, 209 

 Cells, protoplasmic units, 17; struc- 

 ture and history, 26 



249 



