follows : 
“tst. It is single and homological in the external organs. 
"2d. It is double and heterological in the middle organs or 
“3d. It is partially double and heterological in the productive 
organs” (Quhin’s kamag 1876, Vol. in 814). e 
The morphological sexual type of either sex comes thus short 
of comprising a complement of the developed organs of both 
"xes, owing to the fact that for some of the organs, or parts of 
sexual apparatus, the same primary tissue develops into a 
Male organ or part, in one sex, and into a female organ or part 
in order to make all the phenomena of sexual develop- 
ras We wish to know why it is that useless rudi- 
‘Beats appear in one sex of organs that are only required to be 
i in the other sex ; and we wish to know how it is that, 
'n rare cases, each individual, presenting at first the com- 
embryonic type of the whole species, afterward undergoes 
Gn T in the adult sexual characters of one sex 
A the Other sex alone, and does not take an intermediate 
of dev between the two adult types. 
order that a germ-cell and a sperm-cell may effectively 
i the initiation of the development of a new indivi 
be an approximately complete 
“te 
aj 
