16 Director's Report of the 



tained in addition to those on hand dnring the coming year. 

 Chemical work has been directed in two lines : 



(a) Stndying 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, wdiile on the other hand the self-fertile varieties have usu- 

 ally been successful in fertilizing the self -sterile sorts uj)on 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. 



