forms. No recognized form of inheritance can be de- 

 tected in these parthenogenetic lines. If, as generally 

 supposed, there is no elimination of chromosomes in the 

 parthenogenetic egg f Daplmians, the expectation would 

 be that all offspring of an intermediate would be like the 

 mother, whether the "character" were recessive or domi- 

 nant. It would seem then that if certain lines of parthe- 

 nogenetic Daplmians do produce more intermediate 

 types than occur in the general population, we must look 

 either to irregularity in the chromosome behavior or to 

 environmental influence. The latter seems excluded by 

 Banta's results to be mentioned later. The former can 

 only be hypothetical until such differences are found. 

 Nevertheless the discovery of such cases in other groups 

 {Drosopliila, (Enothera) makes the suggestion at least 

 not so speculative as might haw appeared several years 

 ago. 



The most important results are those recorded by 

 Banta, not only because he has obtained a much higher 

 percentage of intergrades, but because these appeared in 

 a pedigreed strain, and the appearance of the inter- 

 grades has been carefully followed through later genera- 

 tions. In the 131st generation of one of the strains there 

 appeared males, females and sex intergrades. The last 

 group composed of "males with one or more female sec- 

 ondary sex characters, females with one to several male 

 characters and sonic hermaphrodites with various com- 

 binations of male and female secondary sex characters." 

 Highly male-like females produce only a few young or 

 are sterile. "A female intergrade with as many as six 

 strong male secondary characters rarely produces 

 young." Males that have one or more female characters 

 have nearly always incompletely formed testes. The 

 strain was kept up by breeding from female intergrades 

 that continued to produce females, males, and sex inter- 

 grades for 16 generations with no apparent change in the 

 ratio of the various sex forms." The picture here pre- 

 sented can not but suggest some sort of disintegration or 



