246 Inheritance of Tight and Loose Paleae in Oats 



3. The Fi plants have grains enclosed in pure tight, pure loose, 

 and several intermediate kinds of paleae. The range of variation is 

 very great. 



4. The method of segregation in the Fg generation shows that the 

 inheritance of what may be called the " pure tight " character depends 

 on a single factor. At first sight the number of F^ types appearing in 

 this generation seems to exceed expectation. This is because they 

 include tight-containing " nuda " forms which can be separated out 

 only by further breeding. Such forms never throw pure tights. 



5. Much diversity exists in the quarter of the F^ generation in- 

 capable of yielding any pure tights. These " nuda " forms appear to 

 result from secondary factors; for, according to their type and the 

 manner of their breeding, empirical groupings can be made among 

 them. They require more extensive study. 



6. In extracted pure tights the number of grains per spikelet 

 never exceeds four, no cross-over of the large " nuda " number taking 

 place. 



7. There is no repulsion between grey or brown colour and pure 

 tight paleae. 



