104 T.OfK : STUDIES EN PLANT BREEDING 



yellow and red in various combinations, appearing to include 

 a mixture of the " Alba, " " Cyanea, " "Gilva." and '-Rubra'* 

 forms of Correns. The original specimens were obtained 

 from Mr. A. .1. Kellow of Albion, Nuwara Eliya. 



THE CHARACT E US CONSIDER Eh. 



A.— COLOTJB OF GRAINS. 



1 . 117/ He indicates the absence or non-development of other 

 colours. Such grains are seldom pure white, and in particular 

 sugary grains of this class have a glassy grayish appearance. 



2. Yellow. — This colour appears in chromatophores within 

 the cells of the endosperm including those of thealeurone layer. 



.'{. Blue, black, or purple. — These pigments occur in a soluble 

 form, and are confined to the cells of the aleurone layer. In 

 i ross-bred grains the colour is very liable to vary in shade and 

 intensity in different grains of the same cob and in different 

 parts of the same grain. No definite distinction was drawn 

 I "-i ween the different shades included in this group, but the 

 terms blue or black are used according as either appeared more 

 -uit able in any particular case. 



4. Red. —This colour is confined to the pericarp — a maternal 

 structure. The pigment is situated in the cells and to some 

 ni also in the cell walls of the pericarp. 



In the case of cross-bred cobs it is thus possible for white, 

 yellow, and blue grains to occur mixed together in the sane 

 cob, and further the same grain may contain both the blue 

 and the yellow pigments. On the other hand, the red pigment 

 appeals either in all the grains of a particular plant or not in 

 any of them, since it belongs in facl fco a different generation 

 from the endo perm and embryo enclosed in thai particular 

 pei ioarp. 



B. SHAPE OF CHAIN'S. 



I. Roundness as opposed to wrinkled,ne8&. The difference 

 between these i wo characters depends upon theohemical nature 

 ol the endosperm. In the wrinkled grains the ohemical 

 changes which bake place in the reserve materials during 



