INDEX 



Acalephs: geographical distribution of, 35, 

 40n54, 48, 168; classification of, 53, 150- 

 151, 152, 156-157, 165; size of, 57; era- 

 bryology of, 78-80, lllnHOa; men- 

 tioned, 32, 174, 181, 199, 202, 203, 204, 

 217, 253, 259n62 



Acephala: geographical distribution of, 35; 

 classification of, 53, 106, 157, 164-165; 

 size of, 57; embryology of, 80, 112-113; 

 mentioned, 32, 202, 204, 205, 214, 216, 

 226 



Acotyledones, 109, 254 



Adams, Charles B.: publication of, 40n52; 

 mentioned, 40 



Affinity, compared with analogy, 241-242 



Agassiz, Louis, publications of, 13nl2, 17n- 

 24, 20n29, 23n31, 28n36, 29n37, 30n42, 

 31n43, 31n44, 35n49, 37, 44n59, 44n60, 

 45n61, 56n74, 60n80, 61n82, 61n85, 62n- 

 87, 92nl21, 102nl34, 115, 116nl41, 119n- 

 144, 130nl50, 166nl9, 167n20 



Alternate generation, 91-94, 174 



Amblyopsis spelceus, 17, 39 



Amphioxus, 31 



Analogy: in natural categories, 22, 189- 

 193; and homology, 22-23, 187n33, 188, 

 194; defined, 187, 188, 194; need for pre- 

 cision in determining, 190; and form of 

 animals, 191-192; mentioned, 87, 160- 

 161, 236, 241-242. See also Classification; 

 Homology 



Anatomy: and habits of animals, 65-66; 

 and embryolog)', 86; and classification, 

 213, 213n26; classifications based on, 235- 

 240 



Animals: structure of, 3, 17, 21-23, 40-46, 

 134, 149; origin of, 4, 13-14nl3, 15nl5, 

 39-41, 44-45, 56-58, 59-60n77, 63, 69, 

 72-73, 102-104, 173, 175; relationships 

 between, 14-15, 24-26, 72-76, 137-138; 

 diversity of, 13-14, 16, 26-29, 133, 137; 

 duration of life, 25, 89-91, 135; geologi- 



cal succession of, 33, 94-99, 103-106, 110- 

 115, 119-122; serial connection in, 49-53, 

 117; fixed form of, 58-65, 77-78, 94, 135, 

 161; habits of, 65-66, 68; adaptation to 

 environment, 65-72, 73-75; instincts of, 

 88-89; and plants, 122-123, 254; parasi- 

 tic forms of, 123-127; families of, 161- 

 168; development in, 183-186. See also 

 Classification; Embryology; Fossils; Geo- 

 graphical distribution; Plan of struc- 

 ture; Serial development; Variation 



Annelids, 214, 217, 219 



Arachnids, 214, 217, 219, 227 



Archeology, and permanence of species, 

 59-60, 63 



Aristotle: on homology, 21; on man and 

 primates, 74n99; on natural groups, 140- 

 141, 208-210; classification of, 140-141, 

 210-212; on genera, 208-209; on species, 

 208-209; on classes, 208-209; mentioned, 

 219 



Arthropoda, 199 



Articulata: plan of, 20; analogy in, 22, 

 188-189, 194; homology in, 21-23, 153- 

 154; classification of, 31, 32, 81-83, 105, 

 146, 205-206; geographical distribution 

 of, 34-35, 42-43; embryology of, 81-83, 

 184; parasites of, 124-125; mentioned, 

 6-8, 26, 154, 197, 199, 200, 202, 205, 222, 

 228, 229, 234, 240, 249, 255 



Audubon, John J., publication of, 65n93 



Australia: fauna of, 46-47, 99, 122; fossils 

 of, 100 



Baer, Carl Ernst von: contributions to 

 embryology, 77, 245-246, 251, 251n58; 

 publications of, 77nl02, 77nl03, 87nll5, 

 246, 246n53, 250n56; on form in animals, 

 161; classification of, 247-252; men- 

 tioned, 255, 257 



Baird, Spencer F.: publication of, 52n70; 

 mentioned, 52 



