II 



SUMMARY OF MEANS ELICITING 

 EXPERIMENTAL PARTHENOGENESIS IN 



VARIOUS EGGS 



On the basis of the classification of eggs according to the 

 stage in maturation when the fertilization moment occurs (see 

 I of Appendix), the following summary of single means for 

 inducing experimental parthenogenesis may be made (the 

 Roman numbers indicate the fertilization-class): 



Means: Eggs: 



Hypertonic sea-water Nereis I (without cleavage) 



Chaetopterus II (without 

 cleavage) 



Asterias II 



Echinoidea IV 



Mactra I 

 Heat Nereis I 



Chaetopterus II 



Cumin gia II 



Asterias II 

 Carbon dioxide Asterias II 



Butyric acid Asterias II 



Acids in sea-water Thalassema I 



Hypertonic sea-water is most generally effective, although 

 in some eggs it does not induce cleavage. A named means 

 effective on one species of egg of a given class may be ineffective 

 on that of another member of this class. Thus it is apparent 

 that the means can not be correlated with the stage in which 

 the egg is fertilizable, which is the only stage when exoerimental 

 parthenogenesis can be induced. 



8s 



