Proceedings of the Ohio State Academy of Science 347 



potency" of the egg or sperm in one or the other direction. 

 Certainly these gall-insects show that the allosomes are not sex- 

 determining bodies per se and this is still further established by 

 the fact that the division into male and female layers takes place 

 one generation prior to the formation of the sexes. The evi- 

 dence which Morgan thus gives from the animal side is in com- 

 plete agreement with that presented by the heterosporous pteri- 

 dophytes. We must at present, therefore, regard the allosomes 

 as sex-indicating rather than sex-determining or sex-producing 

 bodies. 



SPECIAL VIEWS REGARDING SEX-INHERITANCE. 



Guyer reports that pheasant hybrids are almost all males 

 and suggests that their sex is due to incompatibility of the germ 

 plasms. The known hybrids resulting from a crossing of guinea 

 fowls and ordinary chickens are also all males. He says that 

 in the case of hybrids and particular!}^ those from widely sep- 

 arated parents, there would in all probability be more or less de- 

 fault in the metabolic processes because of the incompatibilities 

 which must necessarily exist between two germ-plasms so dis- 

 similar. 



Kauffman studied the water molds, Saprolegniaceae, with 

 especial reference to the variations of the sexual organs. He 

 holds that sexuality can be controlled by external conditions. 



Maud and Raymond Pearl made a statistical study based on 

 200,000 births in Buenos Aires. They show that there is a 

 markedly greater preponderance of male to female births in 

 children born of parents of dififerent races. This seems to be in 

 agreement with the results obtained from hybrid pheasants. 



Among botanists, Strasburger, Correns, and Noll believe that 

 the egg tends to produce females. If this were really the case, 

 the reduction division could have nothing to do directly with 

 sex-determination in the heterosporous plants, since no allosomes 

 are known to be present and the eggs are vegetative descendants 

 of. spores produced through reduction. But on the other hand, 

 they think that the reduction division in the microsporocyte sep- 

 arates male tendencies of unequal vigor so that in dioecious 



