DISCHARGE OF MITOCHONDRIA. 311 



chromatin sphere enclosing clear karyolymph (Fig. 3). Next the 

 nucleus lengthens, and distally its chromatin border becomes 

 very thin (Figs. 4, 5, 7, 8); but it could not be determined that 

 at this thin region nuclear sap passes out of the nucleus in the 

 way I have described (1911) for Euschistns. This thin area of 

 the nuclear wall later becomes as thick as the remainder Figs. 9, 

 10). Then the proximal end of the nucleus becomes pointed 

 (Fig. loj. With its later great elongation (Figs. 11-17. and 

 Plate II.) the nucleus changes ii- appearance, due apparently 

 to it- interior becoming more chromatic, so that on -urface \ie\\ 9 

 it appears nearly homogeneous throughout; it continues the same 

 allmity lor ba-ic -tain-, and from tin- -tage of Fig. II onwards I 

 ha\e drawn it brown and not deep black -imply in order to 

 repre-ent the mitochondria more distinctly. Yet CP>-- sections 

 show that even in the mature -perm the chromatin make- a 

 hollou i \ linder and not a solid rod. 



\o\\ to return to the mitochondria, to de-cribe their particu- 

 larly notable phenomenon. After all of them have mo\ ed for- 

 ward from the di-tal pole, carried probably by Currents in the 

 lobe ol < \ lo|i|a-m. t hey fll-e together to produce a true Nebellkern 



01 ( hondrio-omi- Me\e-,'oo). Figs. I l MI -h. .w them becoming 

 agglomerated, and in Fig. [7 they are seen to be In -ing to produce 

 compound vesicles. Fig. IN. PI. II., exhibit- them on the -idi- 

 ot the niicltu-, \\ith tii-ion far advanced, and Fig. MJ, their con- 

 solidation into a chondrioSOme. A- the process of fn-ion ad- 

 Nance- thev -tain more 1 deeply, so that the chondrio-oines when 

 completed appear den-ely chromatic i Fig-. 20 22). Some- 

 time- a few mitochondria remain isolated \\ithout joining with 



the others, sometime- all fuse together Figs. i> 21). Simul- 

 taneou-l\ the c\ topla-mic lobe mo\ e- foruard along the nucleus, 

 01, probably more correctly, the nucleus move- backward 

 through it; and in its substance appear denser strands and 

 minute granules (Figs. 18, 19) which may be degeneration 

 products comparable with the "tingible granules" of mammal-. 

 ( "on-equently, each nearly mature sperm of the seminal vc-icle 

 (\ ; ig-. 20, 21), as all of the vas deferens (Fig. 22), carries near 

 the anterior end of the nucleus a cytoplasmic lobe with a densely 

 staining chondriosome; there appears to be no cytoplasm at all 



