Y. TANAKA. 



It is true that there is no positive reason to deny the possibility of the 

 occurrence of intermediate series besides those forwarded by Bateson. But 

 we must admit, on the other hand, that a decisive proof for the existence 

 of such intermediate systems is also not yet discovered. » 



Concerning the phenomena of coupling and repulsion there are many 

 questions to be answered by future investgations. The more important of 

 those are: 1) At which stage of the ontogeny of an individual does the 

 coupling or repulsion occur?; 2) Is there any selective mating of gametes? 

 3) What is the actual cau.se of the coupling and repulsion? At present 

 I have no data which throws light on these points. 



have furnished 



the question whether the phenomena of gametic coupling and 

 allelomorphism in animals occur independently of the sex-character. In their 

 important paper Batesox and Puxxett remark : "Hitherto no case of 

 coupling has been found in animals. Among the phenomena of repulsion, 

 however, of which many examples exist, certain suspicious cases have been 

 observed which may mean that in animals reduplicated systems exist like 

 tho.se of plants. Nevertheless at present it seems not impossible that the 

 two forms of life are really distinguished from each other in these respects" 

 (19ll,b). However to-day we have no need to make such a di>tim-;ion 

 regarding animals as distinguished from plants. 



