394 LOUIS MAX HICKERNELL. 



in which the chromatic part of the nucleus migrates to the 

 periphery and the cytoplasm becomes more dense. 



7. The movement of chromatin during desiccation phenomena 

 takes place in order that the cell oxidations may continue during 

 the dried condition. 



8. The extent of the structural rearrangement which takes 

 place in the rotifer cells is not directly proportional to the intens- 

 ity of the stimulus. 



9. In animals recovering from desiccation the elements of 

 nucleus and cytoplasm gradually resume normal relationships. 



10. The chromatic rearrangement in the nuclei of cells of 

 drying rotifers takes place at the very beginning of the drying 

 process. 



11. The acceleration of reproductive activity just subsequent 

 to drying is traceable to an increase in ovarian nuclei. This 

 increase takes place while the animal is recovering. 



12. The cytological changes attending a recovery from desic- 

 cation are in their nature the exact reverse of those taking 

 place during the drying process. 



13. The death of cells as a result of desiccation is probably 

 not a result of the activity of concentrated osmotic materials 

 upon the protoplasm as Pfeffer suggests. 



14. The death of rotifers during the desiccation process may 

 be due to one or a combination of the following causes: (i) Me- 

 chanical injury due to too rapid drying, (2) starvation resulting 

 from a lack of reserve food material, (3) the poisonous effect of 

 metabolic products and (4) insufficient time before drying to 

 effect the nuclear-cytoplasmic reorganization. 



