300 C. CLIFFORD DOBELL. 
The Chromidia of Nematodes.—Goldschmidt (04, 
04a), has described at considerable length certain curious 
chromatin strands, which occur in various tissue-cells—especi- 
ally muscle-cells—of Ascaris. These structures he calls the 
chromidial apparatus of the cell. Upon them Gold- 
schmidt’s binuclearity speculations are largely founded. 
The chromidial apparatus is said to consist of chromatin 
extruded from the nucleus when the cell is in a state of 
activity—the amount of chromatin being an index of the 
Trxt-Fie. 18. 
CA 
A. A muscle-cell of Ascaris lumbricoides, after one hour’s 
tetanus, showing the “ chromidial apparatus” (C.A.). which 
is supposed to have come from the nucleus (N.). (In the 
original figure—from a hematoxylin preparation — the 
nucleus is coloured violet, the ‘“ chromidia” black.) (After 
Goldschmidt, ’05.) 
B. A muscle-cell of Ascaris ensicaudata, showing the sup 
porting framework (f.) in the cytoplasm. (After Vejdovsky 
07.) 
Both figures are from transverse sections, so that only a part of 
the cytoplasmic structures is seen. 
degree of activity of the cell. Thus, when an Ascaris! is 
stimulated to violent muscular movement, the chromidial 
apparatus is found more strongly developed in the cell 
(text-fig. 18). 
Leaving out of the question for the moment the vast edifice 
of speculation which Goldschmidt has erected on these obser- 
' A.lumbricoides and A. megalocephala were used. 
