E. E. JUST. 



standard make. In some thirty to sixty seconds after the mem- 

 brane is off from the egg it fully rounds out, equidistant from the 

 surface of the cytoplasm at all points. The following tables 

 taken from the data give some idea of the time relations. The 

 time is in seconds. The last column ("Membrane Off") gives 

 the time at which the membrane is distinctly off the egg at all 

 points but not yet fully rounded. Each record is from observa- 

 tions of a single egg. 



TABLE I. 



TABLE II. 



Insemination. 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 

 O 



TABLE III. 



Membrane Begins. 



31 

 39 

 30 



3i 



29 

 24 

 26 



31 

 30 



40 

 23 

 31 

 30 

 26 



. 27 

 35 

 24 



Membrane Off. 



42 

 4 6 

 50 

 44 

 43 



41 

 42 



49 

 45 

 5i 

 49 

 50 

 45 

 44 

 52 

 45 

 46 



Average time of appearance of cone 90 seconds. 

 Average time of fully rounded membrane 134 seconds. 



