Centrifugal Force upon Beetles^ E,ggs 



517 



in eggs that have been properly stained in toto. Because of their 

 ultimate fate, as explained in the introduction, I have called these 

 granules the germ-cell determinants (Fig. 9, g c. d). 



VII THE EFFECTS OF CENTRIFUGAL FORCE UPON EGGS CENTRI- 

 FUGED AFTER DEPOSITION 



Table I presents in concise form the main points in the series of 

 experiments which have been selected for detailed description. 

 Besides the thirteen series noted here there are also two tables 

 (XI and XIT) which give the results of a number of other series of 

 experiments which were not considered of sufficient importance to 

 describe at length. 



TABLE I 

 List of the experiments described in detail 



Series C.B. 4 — Table II 



The eggs of this series were centrifuged as soon as laid. They 

 were held in place with their posterior ends towards the axis of 

 rotation. Tw^o eggs were removed at the intervals indicated in 

 Table II; one of these two was fixed immediately, the other was 

 allowed to develop. If the latter did not hatch within a period 

 several days longer than the normal hatching time it was fixed. 



