A PRELIMINARY ACCOUNT OF THE SPERMATO- 



GENESIS OF BATRACHOSEPS ATTENUATUS, 



POLYMORPHOUS SPERMATOGONIA, 



AUXOCYTES AND SPERMA- 



TOCYTES. 



GUSTAV EISEN, Pn.D. 



INTRODUCTORY. 



THIS paper is a preliminary report of my investigations on 

 the spermatogenesis of Batrachoseps attcnnatns. The memoir 

 will be published in \.\\e Journal of Morphology, Vol. XVII, No. i. 

 As, however, some considerable time must elapse before the 

 paper can be published, it has been deemed proper to publish 

 this short extract covering a few of the more important points. 



BatracJwscps is adult in the months of June and July, and is 

 at this time difficult to find, as it is then estivating deep below 

 the surface. The testes were fixed by my iridium-chloride 

 method and sectioned in paraffin. The stain used was the 

 iron haematoxylin, according to Benda, and after-staining with 

 congo. The sections were studied with Zeiss Apochromate, 

 2 mm. Ap. 1. 40. The light used was the incandescent gas- 

 light passing through the achromatic filter described lately in 

 the ZcitscJirift f. ivt'ss. Microscopic, Bd. XIV, p. 444. 



The figures illustrating this paper are entirely diagrammatic. 

 No special effort has been made to insert the correct number 

 of chromioles in the chromosomes ; and the author's want of 

 skill in preparing this kind of drawing will account for many 

 other discrepancies. 



CONSTITUENTS OF THE CELL. 



The following general division of the structures of the cells 

 of the testes is proposed : Cytosome, Caryosome, and Archo- 



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