30 Gen. Sub. 
GENERAL SUBJECTS. 
Sertoli, E. Sur la Caryokinese dans la spermatogen&se. Arch. Ital. 
Biol, vii, pp. 309-375 ; Rend. 1st. Lomh. xviii. 
Investigation of karyokinesis in cells of seminiferous canals of ass, 
dog, cat, rabbit, and rat. The sperms which are formed continually in 
tho semiuiferous canals during soxual activity, are presumably developed 
from the cells which are being incessantly reproduced ; but the karyo- 
kinesis shows that the elements continuously renovated are the mobile 
(germinative and seminiferous), and not the fixed (epithelial or ramified) 
cells ; and this is in obvious accordance with Sertoli’s long since expressed 
conclusion that the former, and not the latter, give rise to the sperms. 
Spichardt, C. Entwicklung der mannlichen Geschlechts-orgaue in Lepi- 
dopteren. Yerh. Yer. Rheinl. xliii, pp. 1-34, 1 pi. ; J. R. Micr. Soc. vi, 
pp. 968 & 969. 
Inter alia , observations on spermatogenesis. 
St. George, v. la Valette. Spermatologische Beitrage. Arch. mikr. 
Anat. xxvii, pp. 1-12, 2 pis. ; J. R. Micr. Soc. vi, pp 590 & 591. 
Corroboration of his law of spermatogenesis iu Blatta germanica. 
Origin of accessory nuclear body from the cyto-microsomata in the 
spermatocytes, and of these from the remnants of the spindle fibres. 
Transitory head of sperm from nucleus of spermatide, tail from proto- 
plasm, middle portion from accessory body. 
. Spermatologische Beitrage. Arch. mikr. Anat. xxvii, pp. 1-13, 
4 pis. 
In Beetles (especially Phratora vitellince ) primitive sperm-cells, sper- 
matogonia, spermatocysts of spermatocytes, spermatides, and spermato- 
zoa follow one another as usual. In spermatocyte, accessory nuclear 
body (nebenkern) appears as a simple thickening of the cytoplasm, is 
closely associated with mitosis, and forms, with nucleus, the head of 
sperm. 
. Spermatologische Beitrage. Arch. mikr. Anat. xxvii, pp. 385- 
396, 3 pis. ; J. R. Micr. Soc. vi, p. 935. 
Later stages in ontogeny of sperms in Amphibians. Corroboration of 
author’s law of spermatogenesis^ 
Stuhlmann, Fr. Beitrage zur Anatomie der Mannlichen Geschlechts 
organe und zur Spermatogenese der Cypriden. Z. wiss. Zool. xlvi, 
pp. 536-569, 1 pi. 
“ The testicular tubules of young forms contain only syncytium and 
large cells ; afterwards small cells, spindle-cells, and spermatozoa appear. 
The nuclei of the syncytium at apex of gland become the germinal- 
vesicle-like nuclei of the large cells. These divide repeatedly, and the 
nuclei of the small cells thus arising are spindle-shaped. The nucleus 
forms the central filament of the sperm. The motion of a spiral fringe 
brings sperm into upper part of the vas deferens. A hyaline sheath is 
shed round the sperm, which remains almost motionless within recepta- 
culum seminis of female.” 
Thomson, J. A. [See G edges, P.] 
