404 



Sidney I. Kornhauser 



Fig. 1 kp.), composed of cells of large clear nuclei, usually with one or 

 two deeply staining nucleoli, and cytoplasm of a clear liomogeneous 

 character, whicli staiiis black in haematoyxlin, after fixation inFLEMMiNo's 



chromatin, and mitoses or preparation for division could not be found. It is most prob- 

 able that these cells, judging from their nuclei and the stainability of their cytoplasm, 



Textfigures A— B. 



se/77. 



Fig. A. Hersilia apodiformis. Dorsal view of adult Q with attached (5, showing position of sexual 



Organs, x 52. — Fig. B. Lateral view of adult pair, reconstructed from sections. x 52. 

 e.s., eggsacks; A^;., "Keimpolster" ; o'ii^, oviduct; o?'., ovary; rcc. s«m., receptaculnm seminis; ^e., testis ; 



isl. Sern., vesicula seminalis. 



are concerned in the nourishment of the spermatogonia, which immediately follow 

 and are usually in active midtiplication (Plate IV, Fig. 1). 



That the "Keimpolster'- does not give rise to the germ cells is shown by a study 

 of the sex glands in immature females, of the stage shown in Fig. C. Here the ovaries 

 (Plate IV, Fig. 2) consist of two short curved tubes, each containing nine oögonia — 

 the first two showing the chromatin in prophase conditiou. At this stage there is a 

 "Keimpolster" of foiir cells, lying between the ovaries and clearly separated from them 

 by a membrane. The cells of this "Keimpolster'-' have the same large clear nuclei and 

 black staining cytoplasm which characterized the cells in the "Keimpolster-- of the 

 adult, and make them stand out in contrast to the chromatin-rich germ ceUs. 



