I IO 



FRANK R. L1LLIE. 



to a very strong centrifugal force, 7,500 revolutions in one minute 

 at a radius of 6 cm., because the end effect of such centrifuging 

 is to produce a uniform arrangement of basophile granules in the 

 hyaline band, into which the spindle also is driven. We there- 







FIG. 5. Section of an egg of Chirtopterus centrifuged 1,150 revolutions in 31 sec- 

 onds at a radius of 13 cm. i-i, primary axis of the egg ; 2-2, direction of action of 

 the centrifugal force, secondary axis; b.c., basophile cap;^.^., gray cap; h.b., 

 hyaline band ; s.a., spongy area. The egg was stained in thionin and orange G. 



fore never find such particomposition spindles as in low powers of 

 the centrifuge (see beyond). The karyokinetic figure is usually 

 symmetrically developed after the strongest centrifuging in spite 

 of the fact that rearrangements of granules are more extensive 

 than with lower centrifugal powers. The reason for this must 

 lie in the uniform character of the protoplasm, which is produced 

 in the hyaline band by strong centrifuging. 



