PLATE 3 



EXPLANATION OF FIGURES 



10 Testis of Desmognathus. Photograph at higli magnification (2 mm. apo- 

 chromatic, no. 2 Zeiss projection ocular) of a portion of a lobule of spermatogonia 

 in which one cyst is in an early stage of degeneration. The resemblance to marked 

 synizesis is striking. 



11 Testis of Desmognathus. Photograph at high magnification (2 mm. apo- 

 chromatic objective no. 2 Zeiss projection ocular). To show the karyolytic nuclei 

 in a degenerating lobule and the normal nuclei of the follicle cells. The lobules 

 above contain spermatozoa; those below dividing spermatogonia. 



12 Testis of Desmognathus. A cyst filled with karyolytic cells. The three 

 nuclei in the neighboring cyst (upper left hand corner) are probably just about to 

 enter upon degeneration. 



13 Testis of Desmognathus. Photograph from a lobule of degenerating sper- 

 matogonia. 



14, 15, 16, 17 Pen and ink drawings of camera lucida sketches of typical karyo- 

 lytic cells. The resemblance to the extreme synizesis nuclei described in other 

 forms is striking. 



18, 19, 20, 21 Colored drawings from camera lucida sketches of typical karyo- 

 lytic cells. From preparations stained with the Ehilicli-Iiiondi-Heidenhain 

 triple stain. 



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