316 Heredity. 



zation of the female is latent, in every male; that each 

 individual is a complete double person. If we accept 

 . this conclusion it is only logical to conclude that the 

 power to revert or acquire the characteristics of remote 

 ancestors proves the existence, in a latent state, in each 

 individual, of the complete organization of each of a 

 long series of ancestors of both sexes. 



This subtle metaphysical conception is so foreign to 

 the methods and tendencies of modern thought, that 

 when we compare it with Hunter's simple and definite 

 statement that the natural history characteristics of any 

 species of animal are to be found in those properties that 

 are common to both sexes, there does not seem to be any 

 room for choice. The view that each individual inher- 

 its all the characteristics of the species, and that the dis- 

 tinctive characteristics of the male are arrested in cer- 

 tain ones, while the distinctive features of the female 

 remain latent in others, furnishes a simple and adequate 

 explanation of the facts, and removes all necessity for 

 the subtle, complex and unthinkable, compound person- 

 ality hypothesis. 



In this connection the interesting and practical ques- 

 tion, what determines the sex of the embryo, can hard- 

 ly fail to suggest itself to the reader. I have refrained 

 from a discussion of this important point in the body of 

 this work, as it has no direct bearing upon our argument 

 and I have no solution to offer. As I have so far omitted 

 all reference to the subject, I will take occasion now to 

 call attention, in this connection, to the facts detailed on 

 pp. 55-G9. The reader will see that all female bees arc 

 born from fertilized eggs, and all male bees from unfertil- 

 ized eggs; while the unfertilized eggs of daphnia give rise 

 to females only, and in many of the gall wasps both males 

 and females arc born from parthoBOgenetic eggs. There 



