BULLETIN &47, U. S. DEPARTMENT OF AGRICULTUBE. 
EXPERIMENTAL WORK. 
The feeding experiments were carried on at the Salina Experiment 
Station, in Utah, and were continued through the summer months 
from 1915 to 1919. 
Facilities for chemical work were provided at the Salina station so 
that such work as was dependent on field conditions was conducted 
Fig. Z.—Helenium hoopesii. Young plants showing root system and method of vegetative reproduction. 
there, but the more detailed work was carried on in Washington, 
where laboratory facilities were more complete. 
The plants used were all collected in the immediate neighborhood 
of the Salina Experiment Station, in the Fishlake National Forest in 
Utah. The weights of the plants are all given in the equivalent of 
the green plant. 
The following table gives a summarized statement of the work with 
sheep and cattle and will give an idea of the extent of the experimental 
work on which this paper is based. 
