374 LOUIS MAX HICKERNELL. 



and Callidina I saw the nuclei of the ovary surrounding the 

 large nuclei of the vitellarium but I could not distinguish whether 

 the peculiarity was connected with egg formation or was due to 

 pressure." In this connection I would call attention to the 

 position of three small nuclei in the section of the vitellarium of 

 the rotifer recovering from desiccation shown in Fig. 15. This 

 is one of the many cases I have observed where small numbers 

 of these nuclei are found in the vitellarium. I am certain from 

 observations on hundreds of similar sections that this condition 

 is due to normal causes and cannot be laid to accidental pressure 

 as Janson suggests. I have not been able to follow all the 

 stages in the early development of the egg, but I believe that 

 this condition is a stage in the development of the egg and is 

 not to be confused with those cases where chromatin arising 

 from the nucleus of the vitellarium is found in the cytoplasm of 

 that organ. 



The condition of the different gland cells in animals recovering 

 from desiccation is shown in Figs. 15, 186 and 26. Fig. iSb is a 

 section of foot gland cells of a rotifer which was kept for four- 

 teen days in an evacuated desiccator and then placed in water 

 one and one fourth hours previous to killing. The nuclei are 

 seen to be rapidly assuming the typical condition which is repre- 

 sented in Fig. i8a. The cytoplasmic changes in these glands 

 are perhaps less marked than in any of the other tissues con- 

 sidered. This may be due in part to the nature of their contents, 

 for being impregnated with their gelatinous secretion they 

 would show fewer changes than would other cells whose plasma 

 is less viscous. 



The salivary glands in animals recovering from desiccation 

 show the presence of recently acquired water by the vacuoles 

 scattered at regular intervals throughout their cytoplasm. As 

 recovery becomes complete the cytoplasm assumes the condition 

 shown in Fig. 24 and a typical half-recovered condition is well 

 shown in Fig. 26. In this figure it will be noticed that the 

 karyosomes in the nuclei are of smaller size than in the normal 

 tissue. They have resumed the normal condition, however, in 

 all respects except size. 



In the stomach tissue of the rotifer recovering from desiccation 



