HETEROPLOIDS 183 



ondary trisoinic types of Datura, and have found certain 

 differences that offer a suggestion as to the relation of 

 these two types. In the upper row of Fig. 104 the differ- 



riG. 103. 



Tetraploid capsule above, and below 4114- 1, 40+2, and 4n-(-3 cap- 

 sules. (After Blakeslee, in Journal of Heredity.) 



ent ways in which the three chromosomes of the primary 

 type are united are shown. The numbers below each 

 show the frequency of the type. Of these types the triva- 



