SFECIAL SUBJECTS. 
Gen. Sub,' 35 
c 'SaBATIER, A. Recueil des Memoires sur la Morphologie des elements 
sexucls et sur la nature de la sexualite. Paris : Delahaye & Lecrosmer, 
273 pp., 2 pi. 
Sedgwick, A. Development of the Cape Species of Peripatus. Q. J. 
Micr. Sci. xxvi, pp. 175-207, 3 pis. 
Important observations on segmentation and syncytial character of the 
embryo. “ Embryonic development must rather be regarded as a multi- 
plication of nuclei and specialisation of tracts and vacuoles in a con- 
tinuous mass of vacuolated protoplasm.” 
Seeliger, O. [See Oogenesis.] 
The alternation of generations in Metazoa. 
Spengel, J. W. Bastardbefruchtung. Biol. Centralbl. v, pp. 692-695 . 
Review of (1885) researches of 0. & R. Hertwig. 
Sutton, J. B. On Atavisfti. P. Z. S. 188G, pp. 551-558. 
Primitive hermaphroditism. Non-development of secondary sexual 
characters latent in females, explained in terms of correlation of organs. 
. [See Evolution.] 
Hermaphroditism primitive. Hypertrophy is one of the causes of 
division of sexes. “ Reproduction in vertebrata, so far as is known, is 
impossible unless hypertrophy of one set of organs occurs.” 
Tichomiroff, A. Die kiinstliche Parthenogenese bei Insecten. Archiv. 
Anat. u. Physiol. (Physiol. Abth.), 1886, Suppl. pp. 35 & 36. J. R. 
Micr. Soc. 1887, 73 pp. 
Artificial parthenogenesis of Bombyx mori induced by mechanical and 
chemical stimuli — rubbing with a brush or dipping in concentrated sul- 
phuric acid. In both cases a percentage of the stimulated ova developed. 
Weismann, A. Die Bedeutung der sexuellen Fortpflanzung fur die 
Selektions-Theorie. Jena : G. Fischer. 
Sexual reproduction the most important factor in variation. Conju- 
gation effects not a rejuvenescence, but a strengthening of the forces of 
the organism in relation with reproduction, when from external causes 
the growth of the single animal to the size necessary for reproduction is 
not possible. 
Wilckens, M. Ueber das Geschlechtsverhaltniss und die Ursachen der 
Geschlechtsbildung in Haustieren. Biol. Centralbl. vi (1886), p. 15 ; 
Landw. Jahrb. xv. Berlin: 1886. 
Will, L. Die Enstehung des Eies von Colymbetes fuscus, L. Z. wiss, 
Zool. xliii, and ante. 
Primitive hermaphroditism of ovum (see Oogenesis). The giant and 
smaller epithelial cells are historically interesting, being homologous 
with the cells which in the male form spermatozoa, and indicating 
the primitive hermaphroditism of the primordial ovum. 
Woodhead, G. S., & Hare, A. W. Relations of Micro-organisms to 
Tissue Elements. J. Anat. Phys. xx, pp. 76-99. 
Inter alia , “ The stimulus applied by the presence of micro-organisms, 
