TITLES. 
Gen. Sub. 49 
846. Sowinsky, W. Introduction h, l’etude de la fauue du bassin marin 
Ponto-Aralo-Kaspian sous le point de vue d’une province zoo- 
geographique ind^pendante. Zapiski Kiev. Obshch. xviii, pp. 
i-xiii+ 1-487, + 1-216 + iv. 
Entirely in Russian. 
847. Spaulding, E. G. The special physics of segmentation as shown by 
the synthesis, from the stand-point of universally valid dynamic 
principles, of all the artificial parthenogenetic methods. Biol. Bull, 
vi, pp. 97-122. 
848. . The rhythm of immunity and susceptibility of fertilized sea- 
urchin eggs to ether to HC1, and to some salts. Biol. Bull, vi, 
pp. 224-240. 
849. Spemann, H. Ueber experimentele erzeugte Doppelbildungen mit 
cyclopischen Defect. Zool. Jahrb. Suppl. vii, pp. 429-470, pis. xxiii, 
xxiv. 
850. Spencer, Herbert. Autobiography. 2 vols. London, 1904, xii 
+ 556 pp. and ix + 542 pp. 
Review, Nature lxx, p. 265. 
851. Spengel, J. W. Die Orthographie in zoologischen Zeitschriften. 
Zool. Anz. xxvii, pp. 176-183. 
852. . Ueber Schwimmblasen, Lungen und Kiementaschen der 
Wirbelthiere. Zool. Jahrb. Suppl. vii, pp. 727-749. 
853. Spiess, C. Modifications subies par l’appareil digestif sous l’influence 
du regime alimentaire. C.R. Ac. Sci. cxxxviii, pp. 1123, 1124. 
854. Staples-Browne, R. Experiments on heredity in web- footed pigeon. 
Rep. Brit. Ass. 1904, p. 595. 
855. Stefanowska, Micheline. La croissance en poids des animaux 
et des vegetaux. Arch. Sci. Nat. xviii, pp. 474-476. 
856. StepAnek, Ing. O. Ueber die arobe und anarobe Atmung der Eier. 
Centrbl. Physiol, xviii, pp. 188-205. 
857. Stephan, P. Spermies oligopyrenes et apyrbnes chez les Proso- 
branches. C.R. Ass. Franc, xxxii, 2, pp. 780-783. 
858. Sterzi, G. Die Blutgefasse des RUckenmarks. Untersuchungen 
fiber ihre vergleichende Anatomie und Entwickelungsgeschichte. Anat. 
Hefte Arb. xxiv, pp. 1-364, pis. i-iv. 
859. Stevens, N. M. Further studies on the ovogenesis of Sagitta. 
Zool. Jahrb. Anat. xxi, pp. 243-252, pi. xvi. 
860. . On the germ cells and the embryology of Planaria siniplissima. 
P. Ac. Philad. lvi, pp. 208-218. 
. [See also Boveri & Stevens (130) & Morgan & Stevens 
(657).] 
861. Stevenson, E. C. & Engberg, C. C. Variation in the hooks of the 
dog-tapeworms Taenia serrata and Taenia serialis. Stud. Univ. 
Nebraska iv, pp. 191-230. 
Also published Stud. Lab. Nebraska, No. 59, pp. 409-448. 
862. Stieda, L. Bericht fiber die anatomische, histologisclie und 
embryologische Literatur Russlands, 1902-1904. Anat. Hefte. Ergebn. 
pp. 502-591. 
Account of 130 works ; list pp. 503-512. 
Strangeways, T. S. P. [See Nuttall (678).] 
