56 Gen. Sub. I. general subjects. [1904] 
968. *Zell, Th. 1st das Tier unverniinftig ? Neue Einblicke in die 
Tierseele. Stuttgart, 1904, 198 pp. 
Abstract by von Buttel-Reepen, Zool. Zentrlbl. 1904, p. 673. 
969. ZiEGLER, H. E. Die ersten Entwickelungsvorgange des Echinoder- 
meneies, insbesondere die Vorgaiige am Zellkorper. Festchr. Haeckel 
[Denk. Ges. Jena xi], pp. 539-569, pi. xvi. 
970. . Der BegrifF des Instinctes einst iind jetzt. Zool. Jahrb. Suppl. 
vii, pp. 700-726. 
Summary by L. Plate, Arch. Rassen i, pp. 449, 450. 
971. . tiber die Orthographie in der Zoologie. Zool. Anz. xxvii, 
pp. 183, 184. 
972. . Das zoologische System im Unterricht. Verb. Deutsch. zool. 
Ges. 1904, pp. 163-180. 
[ZiTTEL, K. A. VON. Obituary. See Osborn (685).] 
973. Zykoff, W. Uber das Plankton des Flusses Seim. Zool. Anz. xxvii, 
pp. 214, 215. 
974. . Das Plankton des Seliger Sees. T. c. pp. 388-394. 
IL_SUBJECT-INDEX. 
1. General Works, including General Text-Books, 
Essays, Evolution, etc. 
Special text-books are recorded under the subjects to which the}' refer. 
a. General works on Zoology. General text-books : — 
Modern biology, general exposition, Wasmanx (919). 
General work, Bronn (146). 
Animal Kingdom, general work, Schulze (817). 
Nature of man, German translation, Metschnikoff (614). 
Treatise on zoology. Vol. iii, Echinoderma, Delage & H^rouard (241). 
Compendium of Zoology, 2nd ed., Emery (271). 
Text- book of Zoology, Colton (198). 
Elementary Biology, Parker (697). 
Text-book, Glaus, 7th ed., Grobben (343). 
General review of Zoology, 1903, Caullery & Mesxil (175). 
Text-book of Morphology, Embryology and reproduction Insects, Hex- 
neguy (389). 
A Descriptive zoology, Bizzarrixi (82). 
Zoology and medicine, Blaxchard (84). 
Account of internat. Zool. Congr. 1904, Caullery & Mesxil (176). 
Text-book of Mammalia, Weber (925). 
Social value of Geology and Palceontology, Kraemer (486). 
b. Philosophical : — 
Philosophical biology, popular exposition, Haeckel (362). 
Biology and philosophy, Kerstex (470). 
Natural science and cosmical ideas, Ladexburg (494). 
Conceptions and opinions, of Nature, Driesch (254). 
Theoretical biology, Eeinke's views, Plate (726). 
