192 



Plant-Breeding 



CR 



POLLEN-GRAINS 

 Cr cR 



cr 



Composition of the 9 colored and 7 albino offspring in FZ from the 

 cross between the albino Cr with albino cR, showing the ratio 9 colored : 

 7 albino. 



On the other hand, Bateson advocates the undesir- 

 ability of using such a terminology. He scorns the idea 

 that there is latency of mottling or red in the white forms. 

 Certain factors may be present which are absolutely 

 necessary for the production of such pigments, but this 

 fact does not lead us to contend that there are those colors 

 latent. He emphasizes stating that " sulphate of copper 

 is blue and chloride of copper is green, but it would be 

 incorrect to speak of blue as latent in sulphuric acid, or 

 of green as latent in hydrochloric acid." 



Hurst seems to have difficulty to perceive a factor for 

 absence. He brings forth three distinct views : 



1. The absence factor may be a concrete one, literally 

 representing absence. 



