22 Gen.. Sub. 
GENERAL SUBJECTS. 
Strasburger, E. Histologische Beitrage. Heft I. Ueber Kern- und 
Zellteilung im Pflauzenreiche, nebst einem Auhange fiber Be- 
fruchtung. Jena : 8vo, xviii & 258 pp., 3 pis. 
For summary, see Nature, xxxix, No. 902, pp. 4-6. 
Walbkykr, W. Ueber Karyokinese und ilire Beziehungen zu den 
Befruchtungsvorgangen. Arch. mikr. Anat. xxxii, pp. 1-122, 14 figs. 
An account of the history of research on cell division, with critical 
summaries. 
. Ueber Karyokinese uud ihre Beziehuugeu zu den Befruchtuugs* 
vorgangen. Bonn : 8vo, 122 pp., 14 figs. 
Review, Biol. Centrulbl. vii, pp. 718-720, 
Whitman, C. 0. The Seat of formative and regenerative Energy. 
J, Morph, ii, 1, pp. 27-49. 
The activity of the protoplasm as well as of the nucleus. The organism 
as a whole controls the formative processes going on in each part. 
°Zach arias, E. Ueber Kern- und Zellteilung. Bot. Z. xlvi, 3, 4. 
Zacharias, 0. Ueber Pseudopodien und Geisseln. Biol. Centrabl. viii, 
18, pp. 548 & 549. 
The transition from pseudopodia to cilia. Cf. A. Gruber, Ueber 
einige Rhizopoden aus dem Genueser Hafen. Freiburg i. Br., 1888. 
2 . Oogenesis. ( Including the origin , maturation , and 
fertilisation of the ovum.) 
Beddard, F. E. On the structure of the Graafian Follicle in Didelphys. 
P. R. Phys. Soc. Ediub. ix, 3, pp. 407-412. 
van Beneden, E. Sur la f^condation chez l’Ascarido m6galoc<$phale 
(Rectification). Anat. Anz. iii, p. 104. 
Blociimann, F. Bemerkungen zuden Publikationen fiber die Richtungs- 
korper bei parthenogenetisch sich entwickelnden Eiern. Morph. 
JB. xiii, pp. 654-663. 
BOiim, A. A. Ueber Reifung und Bcfruchtung des Eies von Petromy- 
zon 2 >laneri. Arch. mikr. Anat. xxxii, pp. 613-670, 2 pis. 
The anatomy and histology of the ovary ; the maturation of tho ova ; 
the transitional “lid” of A. Mfiller; the enp-like expansion of the 
germinal vesicle to form the “ pole-plasma.” Several spermatozoa enter, 
and only at the cupola of the animal pole of the ovum. Only one really 
penetrates into the ovum, but the others persist, for a time, in a space 
beneath the cupola. The formation of the two polar bodies. The details 
of fertilisation are described. 
Born, G. Ueber die Furchung des Eies bei Doppelbildungen. J. Ber. 
schles. Ges. lxv, pp. 79-90. 
Conditions of segmentation in ova which give rise to double monsters. 
