tg2t] COOK—PEACH YELLOWS AND LITTLE PEACH 253 
leaves collected in the morning as in the afternoon (figs. 9, 10), 
but was less than in the trees affected with yellows (figs. 5,6). In 
some other sections, however, the amount of carbohydrates in both 
morning and afternoon sections was greater than that shown in 
figs. 9 and 10. The starch in the sections from leaves cut in the 
morning was most abundant in the central part of the leaf (fig. 9), 
and may indicate some translocation. A morning section of leaf 
from Elberta infected with little peach (fig. 11) showed a large 
amount of starch, indicating that very little translocation of starch 
had taken place during the preceding night. . 
Pieces of new growth shoots were collected at the same time that 
the leaves and sections from Elberta, Stump, Hiley, and Chinese 
cling were studied. The results were practically the same through- 
out, but as the material from the Hiley was most abundant and most 
satisfactory it is used for this part of the discussion. A comparison 
of morning and afternoon sections of young shoots from a healthy 
tree shows a considerable amount of starch in the inner layers of 
cortex in the afternoon section (fig. 13) and very little in the morning 
section (fig. 12), indicating normal translocation of carbohydrates. 
These twigs were from the same tree as the leaves in figs. 3 and 4. 
The shoot from the tree affected with yellows (figs. 14, 15) was 
slightly older than the healthy shoot. The amount in the morning 
and afternoon was practically the same, indicating that there was 
little or no translocation of carbohydrates. These twigs were from 
the same tree as the leaves shown in figs. 5 and 6. The sections 
from the tree affected with little peach showed a slightly smaller 
amount of starch in the morning (fig. 16) than in the afternoon 
(fig. 17), which may possibly indicate that there was a small amount 
of translocation. These twigs were from the same tree as the 
leaves in figs. 9 and ro. 
It will readily be seen that all these studies on both the leaves 
and the new growths indicate that the translocation of starch is 
partly or completely inhibited in the diseased trees, probably 
dependent upon the severity of the disease. This is indicated by 
the large amount of starch present in leaves and green twigs from 
diseased trees in the early morning, as compared with the relatively 
small amounts in leaves and green twigs from healthy trees at the 
