24 DrrEcTor’s REPORT. 
TECHNICAL BULLETINS. 
It has seemed best to make a slight change in the numbering of bulletins 
of this Station; and to issue, in future, a series to include discussions of 
technical and scientific phases of our work. Those issued during 1906 are 
as follows: 
No. 1. November. A study of the metabolism and physiological effects of 
certain phosphorus compounds with milch cows. W. H. JorDAN, 
K, B: Hart and: A... J.oPATrEN, Paees so. 
No. 2. December. An outbreak of the European currant rust. F. C. 
STEWART. Pages 14, plates 3. 
No. 3. December. I. The action of dilute acids upon casein when no 
soluble compounds are formed. II. The hydrolysis of the 
sodium salts of casein. L. L. Van StyKe and D. D. Van SLYKE. 
Pages 8&8, figs. 17. 
Several bulletins previously issued are of the same general character. 
‘These are: 
No. 214. A study of some of the salts formed by casein and paracasein with 
acids; their relations to American cheddar cheese. 
No. 215. Methods for the estimation of the proteolytic compounds con- 
tained in cheese and milk. 
No. 219. Some of the compounds present in American cheddar cheese. 
No. 231. The relation of carbon dioxide to proteolysis in the ripening of 
cheddar cheese. 
No. 233. Renet enzyme as a factor in cheese ripening. 
No. 236. Conditions affecting chemical changes in cheese ripening. 
No. 237. The role of the lactic-acid bacteria in the manufacture and in 
the early stages of ripening of cheddar cheese. 
No. 238. The status of phosphorus in certain food materials and animal 
by-products, with special reference to inorganic forms. 
No. 250. The nature of the principal phosphorus compound in wheat bran. 
No. 256. Seed selection according to specific gravity. 
No. 261. Some of the relations of casein and paracasein to bases and acids, 
and their application to cheddar cheese. 
No. 265. I. Plant-food constituents used by bearing fruit trees. II. Tabu- 
lated analyses showing amounts of plant-food constituents in 
fruits, vegetables, etc. 
CIRCULARS. 
No. 6, new series, April 5. The renovation of worn-out orchards. U. P. 
Heprick. Pages 4. 
No. 7, new series, April 25. The “King System” of: stable ventilation. 
W. H. Jorpan. Pages 4, figs. 5. 
W. H. Jorpan, Director. 
New York Agricultural Experiment Station. 
Geneva, N. Y., Dec. 31, 1906. 
