22 R. A. EMERSON 
death of the lower leaves is caused by drouth, there is no corresponding 
development of red color. 
At the age of six weeks, the plants in rich soil were beginning to show 
slightly the color differences that in later stages are characteristic of 
purples, sun reds, dilute purples, and dilute sun reds. In poor soil, on 
the contrary, no color differences were seen. All the four types were 
highly colored thruout except for the youngest leaves (Plate IX, 1 and 2). 
At the flowering period, the plants in rich soil exhibited all the 
peculiarities of color by which purples, sun reds, dilute purples, and dilute 
sun reds are normally differentiated. Even in the poor soil something 
of the same color differences were discernible between the purples and 
sun reds on the one hand and the dilute purples and dilute sun reds on 
the other, but it is doubtful whether these two groups could have been 
separated accurately from a mixed culture. It would have been very 
difficult also to separate with certainty the purples from the sun reds 
or the dilute purples from the dilute sun reds, except by differences in 
anther color and by an examination of the inner husks and other parts 
protected from sunlight. Differences between the plants in rich and in 
poor soil were still pronounced in the case of dilute purples and dilute 
sun reds, but were scarcely discernible in the case of purples and sun reds 
except that the leaf blades were somewhat more highly colored with poor 
than with rich soil and that thruout the plants the colors appeared 
brighter in the former case owing to the less intense green of the poor- 
soil lots. 
The seedlings of both brown and green color types showed no brown 
nor red color in either the rich or the poor soil.. At the age of two months, 
some brown pigment began to show in the lower sheaths of the brown 
type, and at the flowering stage the plants had the typical coloration of 
brown plants. The difference in the development of brown between rich 
and poor soil was at no time very noticeable. The color showed perhaps 
slightly earlier, and was perhaps slightly more intense, with the poor 
soil. Even this apparent difference, however, may have been due merely 
to the fact that the plants in poor soil were lighter and more yellowish 
green than those in rich soil. Dark green might readily mask the brown 
color somewhat. Green plants of both type Vie and type IVg exhibited 
no red nor brown color at any stage of development in either rich soil 
or poor soil. 
