346 
Journal of Agricultural Research 
Vol. II, No. s 
sharp contrast was obtained. This proved to be a quick, convenient 
method, and the stain is fairly permanent if the clove oil is carefully 
washed off with xylol before mounting in balsam. 
Fig. i.—D iagrammatic representation of the occurrence of infection in the nodal buds or branches of 
several sorghum plants. 
In figure i each plant is designated by a letter and its culms by numerals. The 
culms are represented with nodes and with branches where they occurred, but with¬ 
out leaves, sheaths, or roots. The growth at each node is represented as follows: 
A bud which has developed a panicle, either directly evident, as in the main inflores¬ 
cence, or rudimentary and discovered in dissecting, is represented by a circle, while 
buds developed to a lesser degree are represented by a subovate symbol. Those 
showing spore development or, upon microscopic examination, the presence of the 
hyphae of the parasite, are shown in solid black, while those which were normal are 
in outline. In cases where the panicle was not completely parasitized or where the 
inflorescence, while showing no spore formation, was wholly or partially sterile, the 
culm is represented as extending through it, the presence or absence of spore forma¬ 
tion being indicated as above. When no growth is represented at a node, it signifies 
that the bud was lost in handling or that for some other reason it was not examined. 
