182 BULLETIN 1199, TJ. S. DEPARTMENT OF AGRICULTURE. 
313. The occurrence of red calves In black breeds of cattle. By L. J. Cole and Sarah V. H. Jones. June, 
1920. 
314. Wisconsin livestock shipping associations. By B.H.Hibbard, L. G.Foster, and D. G. Davis. Aug., 
1920. 
315. Cottage cheese and buttermilk cheese: Their manufacture and sale. By J. L. Sa mmi s. June, 1920. 
316. Farm labor in Wisconsin. By H. C. Taylor and J. D. Black. June, 1920. 
317. Off-year apple bearing and apple spur growth. By R. H. Roberts. July, 1920. 
318. Credit needs of settlers in upper Wisconsin. By R. T. Ely, B. H. Hibbard, and A. B. Cox. Oct., 
1920. 
319. Experiments in farming: Annual report of the director of the experiment station, 1918-19. By H. L. 
Russell and E. B . Morrison. Sept., 1920. 
320. Clear more land. By John Swenehart. Dec, 1920. 
321. Cheesemakers save by figuring costs . By J. L. Sammis and O. A. Juve. Nov., 1920. 
322. Marketing by federations. By Theodore Macklin. Dec^ 1920. 
323. New farm facts: Annual report of the director, 1919-20. By H. L. Russell and F. B. Morrison. Dec, 
1920. 
RESEAECH BULLETINS. 
1. The role of inorganic phosphorus in the nutrition of animals. By E. B. Hart, E. V. McCollum, and 
J. G. Fuller. June, 1909. 
2. Factors influencing the phosphate content of soils: Phosphate content of soils as affected by methods 
of farming. By A. R. Whitson and C. W. Stoddart — Phosphate availability in its relation to 
soil acidity. By C. W. Stoddard. June, 1909. 
3. The efficiency, economy and physiological effect of machine milking. By F. W. Woll and G. C. 
Humphrey. June, 1909. 
4. Some conditions which influence the germination and fertility of pollen. By E. P. Sandsten. June, 
1909. 
5. The role of the ash constituents of wheat bran in the metabolism of herbivora. By E. B. Hart, E. V. 
McCollum, and G. C. Humphrey. June, 1909. 
6. Studies on the bacterial and leucocyte content of milk: Bacterial content of the milk of individual 
animals. By E. G. Hastings and Conrad Hoffman. — The occurrence and distribution of a lactic 
acid organism resembling the Bacillus bulgaricus of yogurt. By E. G. Hastings and B . W. Ham- 
mer. — Experimental leucocytosis in the cow's udder. By Conrad Hoffman. June, 1909. 
7. Factors controlling the moisture content of cheese curds. By J. L. Sammis, S. K. Suzuki and F. W. 
Laabs. Feb., 1910. 
8. Nuclein synthesis in the animal body. By E. V. McCollum. May, 1910. 
9. The nature ofthe acid-soluble phosphorus compounds of some important feeding materials. By E. B. 
Hart and W. E . Tottingham. May, 1910. 
10. Some improved methods of dairy chemistry analysis: A volumetric method for the estimation of 
casein in cows' milk. By E. B. Hart. — The quantitative estimation of lactic acid in cheddar 
cheese. By S. K. Suzuki and E. B. Hart.— The relation of different acids to the precipitation of 
casein and the solubility of cheese curds in salt solutions. By J. L. Sammis and E. B. Hart. 
May 1910. 
11. The production of volatile fatty acids and esters in cheddar cheese and their relation to the development 
of flavor. By S. K. Suzuki, E. G. Hastings, and E.B. Hart. June, 1910. 
12. Some factors concerned in the fixation of nitrogen by azotobacter. By Conrad Hoffman and B. W. 
Hammer. June, 1910. 
13. Studies of the protein requirements of dairy cows. By F. W. Woll and G. C. Humphrey. June, 1910. 
See also Bui. 200. 
14. Sulphur requirements of farm crops in relation to the soil and air supply. By E.B. Hart and W. H. 
Peterson. Apr., 1911. 
15. Experiments on spore germination and infection in certain species of Oomycetes. By I. E. Melhus. 
June, 1911. 
16. The place of economics in agricultural education and research. By H. C. Taylor. June, 1911. 
17. Physiological effect on growth and reproduction of rations balanced from restricted sources. By 
E. B. Hart, E. V. McCollum, Harry Steenbock, and G. C. Humphrey. June, 1911. 
18. A sclerotium disease of blue joint and other grasses. By A. B. Stout. June, 1911. 
19. Effect of heat and oxidation on the phosphorus of the soil. By P. P. Peterson. Dec, 1911. 
20. Factors influencing the availability of rock phosphate. ByEmilTruog. Jan., 1912. 
21. Studies ofthe nutrition ofthe pig. By E. V. McCollum and Harry Steenbock. Feb., 1912. 
22. Metabolic water: Its production and role in vital phenomena. By S. M. Babcock. Mar., 1912. 
23. Relation of soil bacteria to evaporation. By Conrad Hoffmann. Apr., 1912. 
24. The diagnosis of contagious abortion in cattle by means of the complement fixation test. By F. B. 
HadleyandB. A. Beach. June, 1912. 
25. Studies on the factors concerned in the ripening of cheddar cheese. By E. G. Hastings, A. C. Evans, 
and E.B. Hart. July, 1912. 
26. Studies in dairy production based on the records secured in the Wisconsin dairy cow competition, 
1909-11. ByF.W.Woll. Oct., 1912. See also Bui. 226. 
27. The manufacture of cheddar cheese from pasteurized milk. By J. L. Sammis and A. T. Bruhn. 
Dec, 1912. 
28. Avian tuberculosis. By E. G. Hastings and J. G. Halpin. Mar., 1913. 
29. Nature of the changes in the solublity and availability of phosphorus in fermenting mixtures. By 
W. E. Tottingham and Conrad Hoffmann. May, 1913. 
30. Calcium and phosphorus supply of farm feeds and their relation to the animal's requirements. By 
E. B. Hart, Harry Steenbock, and J. G. Fuller. Feb., 1914. 
31. The control of damping-off disease in plant beds. By James Johnson. Mar., 1914. 
32. Black rot, shed burn, and stem rot of tobacco. James Johnson. June, 1914. 
33. Comparative efficiency for growth of the nitrogen of alfalfa hay and corn grain. By E.B. Hart, G. C. 
Humphrey and F. B. Morrison.— The comparative efficiency for milk-production ofthe nitrogen 
of alfalfa hay and corn grain. By E. B. Hart, G. C. Humphrey, J. J. Willaman, and A. R. Lamb. 
June, 1914. 
34. The social anatomy of an agricultural community. By C. J. Galpin. May, 1915. 
35. The comparative effect of phosphates and sulphates on soil bacteria. By E.B. Fred and E.B. Hart. 
June, 1915. 
36. Acidosis in omnivera and herbivora and its relation to protein storage. Bv Harrv Steenbock, V. E. 
Nelson, and E. B. Hart. Sept., 1915. 
37. Germination and infection with the fungus of the late blight of potato (Phytophthora infestans). By 
I. E. Melhus. Aug., 1915. * 
38. The control of cabbage yellows through disease resistance. Bv L. R. Jones and J. C. Gilman. Dec., 
1915. 
