00 ffeterofityUsm in Oxalis 



These figures increase our knowledge on certain points. 



(1) There is no evidence against the supposition that male and 

 female gametes of a plant are carrying the same qualities. Compai-e 

 A and A' etc. In the four groups A — D there is good agreement 

 with their reciprocals A' — U. 



Note, however, the excess of Shorts in B, and the excess of Mids 

 in B'. 



(2) Two of the three Shorts used are similar in constitution (9/1 

 and 70/5). It was not possible to cross the third Short with any of 

 the Mids used with 9/1 and 70/5, so no comparison can bo made. 



(3) The seven Mids used can be classed according to their offspring 

 when crossed with the same Short. 



Four different Mids were used with the Short 9/1; — giving: 



Longs 

 „ 

 8 „ 

 10 „ 



28 Mids : 25 Shorts Cross 1 Mid-parent 9/2 



30 „ :24 „ „ 11 „ 9/3 



8 „ : 8 „ „ 14 „ 70/4 



17 „ :29 „ „ 20 „ 37/1 



Again these four Mids were crossed with the Short 70/5 ; — giving : 

 Longs : 33 Mids : 21 Shorts Cross 4 Mid-parent 9/2 

 „ :43 „ : 39 „ „ 3 „ 9/3 



84 „ : 76 „ : 133 „ „ 6 „ 70/4 



8 „ : 4 „ : 10 „ „ 5 „ 37/1 



Clearly the Mid-pai-ents 9/2 and 9/3 aie similar, and differ in con- 

 stitution from 70/4 and 37/1. 



In the case of the remaining three Mids used as parents for the 

 Fi generation, there is no comparative evidence on their conformity 

 with one or other of the above classes, or on the possibility of their 

 representing a third type of Mid-styled plant. 



TABLE VI. 



Showiny the ratios yivini hy tlie Jotir Mid-parents crossed with two 

 similarhj constituted Shorts; and of tlie three remnininy 

 Mid-parents crossed with Shorts of unknown constitution. 



