1902.] NATURAL SCIENCES OF PHILADELPHIA. 341 



Each secreting cell has one or two, rarely three, nuclei. When 

 there are two, which is by far the most common number, they are 

 most often abreast of each other, at the same height from the base 

 and at equal distances from the lateral walls (fig. 23). The form 





Fig. 23. — Section of a mature cell, X 600, of the liepatopancreas of 

 Oniscus asellus, only moderately filled with zymogen. The gradation iu 

 size of the granules from base to apex of the cell i* well seen here. 

 Fixation, Flemming's fluid. Observe a space about each of the larger 

 globules. Compare fig. 15. 



of the nuclei in the fresh condition is ellipsoidal or spherical. 

 After several fixations it may present processes of various size and 

 extent, but these again are to be ascribed to the unilateral penetra- 

 tion of the fluids (p. 305).=" 



2"Prenant (42) has mentioned such processes toward the base of the 

 cell as occurring after Flemming's fixation, and has interpreted them as 

 analogous to those which were described by Conkliu in the intestinal cells; 

 also to those described by Korschelt for the nuclei of silk glands of the 

 Lepidoptera and of the egg cells of Dytiscus. The fact that tlie pro- 

 cesses are turned toward the source of nourishment and opposite the 

 direction of penetration lends some probability to Prenant's view, 

 whereas, in line with the results obtained by injection into the lumen of 

 the intestine, one would expect the processes in this case to extend 

 toward the lumen if caused artificially. In the absence of positive evi- 

 dence from the experiment of injecting into the lumen of the liepatopan- 

 creas, which is very difficult on account of the small size of the tubes, it 

 might be urged further in explanation of Prenant's observation, first, 

 that Flemming's fluid is known to cause processes in the nuclei of the 

 intestinal cells ; secondly, that occasionally in these cells processes are 



