16 eo Drrector’s Report OF THE 
tained in addition to those on hand during the coming yeai. 
Chemical work has been directed in two lines: 
(a) Studying the influence of moisture and temperature upon 
the composition of cheese, working with the temperatures 55°, 
60°, 65° and 70° F. 
(b) Studying the chemical compounds formed in cheese by 
the breaking down of milk casein. 
HORTICULTURAL DEPARTMENT. 
The fertilization of self-sterile grapes.— It has been shown in 
Bulletin 157 and other prior publications of this Station, that 
certain kinds of American grapes are either self-sterile or very 
imperfectly self-fertile. When self-pollinated the former bear 
no fruit and the latter produce very imperfectly formed clusters 
or usually none at all. In considering the practical bearing of 
these discoveries upon the selection of varieties for planting and 
the advantageous arrangement of them in vineyards for securing 
well filled fruit clusters, the question arose whether any other 
variety which blooms at the same time with the one which is to 
be fertilized will perform the necessary cross fertilizing success- 
fully or whether some kinds of grapes are better fertilizers than 
others. Scarcely any definite information on this subject could 
be found. The matter being one of obvious practical importance 
to viticulturists, some investigations concerning it were begun in 
1899. Very marked results have already been secured, indicat- 
ing that a variety which is more or less incapable of fertilizing 
itself generally fails in the fertilizing of other self-sterile varie- 
ties, while on the other hand the self-fertile varieties have usu- 
ally been successful in fertilizing the self-sterile sorts upon which 
they have been tried. Further investigation is necessary to de- 
termine whether any grape may be more successful in fertilizing 
some varieties than others. Various other tests need to be made 
before a final report is given stating definitely the conclusions 
which may be drawn concerning the question under investiga- 
tion. 
