Processes of the Echinoderm Egg during Fertilisation. 421 



50 60 

 Minutes 



Fig. 2, b. — Curve of 2 consumption and C0 2 liberation for Experiment II. 

 9 mgrm. egg nitrogen. 



of oxygen manometer, and the same quantity in a chamber of C0 2 apparatus. 

 The eggs were fertilised. Those in the oxygen manometer showed that at 

 the end of 



1 minute after addition of the sperm eggs had consumed 6 - 95 c.mhi. oxygen. 



2 minutes 



3 



4 



5 

 10 

 20 

 30 

 40 

 60 



10-0 

 18-0 



22- 



23- 05 

 34-5 

 47-0 

 58-3 

 66-2 

 85-0 



