58 Gen. Sub. 
I. GENERAL SUBJECTS. [1904] 
Plurality of inhabited worlds, Wallace (914). 
Account of book by Laloy, Zander (965). 
Extinction, geological, of species, Abel (3). 
Evolution of sex ornament, Lameere (497). 
Changes in habitat etc., pcecilogony, Bohn (102). 
Recent modification of Alpine fauna, Corcelle (207). 
Anabolism, results of distinctions in, Crampton (215). 
d. Variation: — 
Variation, Abric (7). — Variation etc., botanical, Tschermak, E. (888). 
Variation, kinds of and nature of, Hickson (407). 
Mutation theory, Hubrecht (419). — Mutation, see also c. 
Mutations and species, Crustacea , Bouvier (125). 
Correlative variation in numerous individuals and species, Krempf 
(488). 
Progressive reduction of variability, Rosa’s views, Plate (728). 
Dimorphic forms, and species, Coutagne (124). 
Variation acquired and inherited, selection of small distinctions, Cou- 
tagne (211). See also f. 
Statistical methods, variation etc., Davenport (231). 
Skew variation, Lutz (565). 
Variation in human skull, races, Sergi (829). 
Variation of cranial bones, man, Le Double (510). 
Numerical variation, vertebrae, man, Bardeen (38). 
Variation in Insects with discussion of general points, Kellogg & Bell 
(465). 
Polymorphism and variation, ants, Forel (294a). 
Physiology of variation, Lepidoptera , von Linden (530, 531). 
Variation and selection in a Saturniid moth, Crampton (217). 
Comparative variation of drones and worker bees, Lutz (566), & Philipps 
(723). 
Variation in Mollusca, definition and aetiology, Bellini (66). 
Variation, rays of Pectcn , Davenport & Hubbard (232). 
Variation, Helix , Lang (498). 
Variation, shell of Neritina virginea , Metcalf (610). 
Variability and autotomy, Phataria , Monks (637). 
Variation, Pyramidida , biometric, Collins (197). 
Aetiology of variation, Anurcea , Lauterborn (506). 
Variation in teeth on Arachnid claws, Hartmann (380). 
Seasonal polymorphism, Daphnia , experiments, Ostwald (689). 
Variation, statistical, mathematical, correlative, hooks of Tcenia t 
Stevenson & Engberg (861). 
Variation and correlation, Lumbricus , dimensions and number of somites, 
Pearl & Fuller (703) ? Arcella , shell, iid. (702). 
Variation, measurements, Phyllodactylus , Camerano (167). 
New York Devonic, indigene and alien faunas; Clarke (191). 
e. Adaptation, Convergence, Environment: — 
Adaptation, Ganong (309). — Adaptation, colour, Hargitt (373, 374). 
Degeneration and adaptation, Lendenfeld (516). 
Environment factors, Peirce (711). 
Digestive apparatus and alimentary regime, Spiess (853). 
History of eye of Amblyopsis, Eigenmann (270). 
Ear of Phoccena , Boennighaus (90). 
, Direction of hair, Whipple (937). 
Marine respiration, Bounhiol (124). 
Adaptation of egg-capsule of Chimcera , Dean (235, 236). 
Convergence, theory, Friedmann (301). 
