Report of the Director for the Year 1898. 
The work of the Station during the past year has been along 
the lines followed for several previous years. The principal 
subjects of inquiry have been the effects of fertilizers upon the 
growth and composition of plants, dairy bacteriology, the feed- 
ing of cows and sheep, and the food and nutrition of man. 
EXPERIMENTS UPON THE EFFECTS OF FERTILIZERS ON THE 
PROPORTION OF NITROGEN IN PLANTS, AND UPON THE 
Peon De Olt nie CROPS) PRODUCED. 
These experiments have been made with grasses of different 
kinds, oats, corn, potatoes, cow peas, and soy beans, grown in 
field and garden plots, and in pots. The experiments in field 
and garden plots have been in progress for a number of years, 
and results have been published in previous Reports of the 
Station. In the field experiments during the early years, 
attention was given to the amounts and composition of the 
crops provided with different fertilizers. For two or three 
years past more especial attention has been devoted to the 
effects of mineral and nitrogenous fertilizers upon the propor- 
tions of nitrogen in the plants grown, with their use both in 
field and garden plots. Pot experiments for the study of the 
“same question have been lately undertaken. 
DAIRY BACTERIOLOGY — BOVINE TUBERCULOSIS. 
The inquiries in these lines have had reference to two 
general topics; bovine tuberculosis, and the effects of bacteria 
in the handling of milk and the making of butter and cheese. 
The experimental work of the past year has been carried on 
by Mr. Esten, who has for several years been the assistant of 
Prof. Conn. The most important contribution, however, has 
been made by Prof. Conn, who has improved a year’s stay in 
Europe to visit universities, bacteriological laboratories, hy- 
gienic institutes, experiment stations, and dairying establish- 
ments in England, Holland, Denmark, Germany, Switzerland, 
