76 
BULLETIN 1199, U. S. DEPARTMENT OF AGRICULTURE. 
15. The influence of certain acid-destroying yeasts noon lactic bacteria. By Zae Northrup. June, 1912. 
16. The bacterial activity in soil as a function of grain-size and moisture content. By Otto Rahn. June, 
1912. 
17. An investigation of soil temperature and some of the most important factors influencing it, By G. J. 
Bouyoucos. Feb., 1913. 
18. A bacterial disease of June beetle larvae, Lachnosterm spp. By Zae Northrup. June, 1914. 
19. Soil acidity. By J. E. Harris. July, 1914. 
20. Experiments on the control of the root-knot nematode. By J. A. McClintock. July, 1915. 
21. How contact insecticides kill: HI, Relating evidence, further, of certain properties of carbon disul- 
phide, gasoline, and a few other fluids, as well as temperature and some dry powdered contact 
insecticides, by means of which the insecticidal action of these agents is accomplished after their 
absorption into the insect tissues, or after mere application; including also brief suggestions for 
possible practice. By G. D. Shafer. July, 1915. 
22. Effect of temperature on some of the most important physical processes in soils. By G. J. Bouyoucos. 
July, 1915. 
23. A simplified apparatus for measuring the conductivity of electrolytes. By R. P. Hibbard and C. W. 
Chapman. Nov., 1915. 
24. The freezing point method as a new means of measuring the concentration of the soil solution directly 
in the soil. By G. J. Bouyoucos and M. M. McCool. Dec, 1915. 
25. The leaf-spot disease of tomato. By Ezra Levin, E. A. Bessey, and G. H. Coons. Mar., 1916. See 
Spec. Bui. 81. 
26. Soil temperature. By G. J. Bouyoucos. Jan., 1916. 
27. The freezing point method as a new means of determining the nature of acidity and lime requirements 
of soils. By G. J. Bouyoucos. Mar., 1916. 
28. The soil solution obtained by the oil-pressure method. By J. F. Morgan. Oct., 1916. 
29. Keeping qualities of butter: IV, Cream ripening and its influence (contribution), bacteria in cream, 
their numbers and types and their itinerary in the manufacture of butter. By C. W. Brown 
and Kurt Peiser. Oct., 1916. 
30. Keeping qualities of butter: V, Pasteurization.and its influence (contribution), a study of the factors 
which influence the resistance of lactic acid bacteria to heat. By C. W. Brown and Kurt Peiser. 
Oct., 1916. 
31. Further studies on the freezing point lowering of soils. By G. J. Bouyoucos and M. M. McCool. Nov., 
1916. 
32. The transmission of Bacterium abortus (Bang) to new-born calves through the ingestion of milk. By 
I. F. Huddelson. Oct., 1916. 
33. A study of the presence of Bacterium abortus (Bang) in milk. By L. H. Cooledge. Oct., 1916. 
34. A study of the factors which govern mating in the honey bee. By G. D. Shafer. July, 1917. 
35. Organic nitrogenous compoundsin peat soils, III. By C. S. Robinson and E. J. Miller. Aug., 1917. 
36. Classification and measurement of the different forms of water in the soil by means of the dilatometer 
method. By G. J. Bouyoucos. Sept., 1917. 
37. The freezing point method as a new means of studying velocity of reaction between soils and chemical 
agents and behavior of equilibrium. By G. J. Bouyoucos and W. A. Laudeman. Sept., 1917. 
38. Experiments on the control of bean anthracnose and bean blight. By J. H. Muncie. Dec, 1917. 
39. Soil solution as an index of the biological changes in the soil. By J. F. Morgan. Sept., 1917. 
40. Physiological balance in the soil solution. By R. P. Hibbard. Sept., 1917. 
41. Studies upon the bacterial flora of samples of milk with high cellular counts as drawn from apparently 
normal udders. By L. H. Cooledge. Jan., 1918. 
42. Relationship between the unfree water and the heat of wetting of soils and its significance. By G. J. 
Bouyoucos. Mar., 1918. 
43. Soluble salt content of soils and some factors affecting it. Bv M. M. McCool and C. E. Millar. Nov., 
1918. 
44. Rate and extent of solubility of soils under different treatments and conditions. By G. J. Bouvoucos. 
June, 1919. 
45. The effect of fertilizer salts treatments on the composition of soil extracts. Bv C. H. Spurwav. Aug., 
1919. 
46. The use of solutions of ammonium citrate for the estimation of reverted calcium phosphate. By C. S. 
Robinson. Oct., 1919. 
47. Studies hrthe heat resistant organisms of cold-packed canned peas. By Ruth Normington, under the 
direction of Ward Giltner and Zae N. Wyant. Nov., 1919. 
48. The Lecania of Michigan. By R. H. Pettit and Eugenia McDaniel. Mar., 1920. 
49. Studies. in infectious abortion: 1, On the presence Bacterium abortus in the deeper of layers of the 
mucous membrane of the nongravid uterus; 2, a few notes on the isolation and cultivation of Bac- 
terium abortus with special reference to liver and spleen media; 3, on the possibility of differen- 
tiating between infected and immune animals in infectious abortion. By H. J. "Stafseth. — 4, 
The isolation of Bacterium abortus from milk. By I. F. Huddelson. Nov., 1920. 
MINNESOTA. 
Agricultural Experiment Station of the University of Minnesota, University Farm, St. Paul. 
BULLETINS. 
1. Reports on Russian apples; wheat experiments and potato culture. By E. D. Porter. Jan., 1888. 
2. Silos and ensilage: tests of varieties of corn for feeding values: examination of beets and other roots 
for sugar and feeding value. By E. D. Porter and J. A. Dodge. Apr., 1888. 
3. Our Russian apples at the opening of their fourth season: natural and artificial fertilization of plants. 
By S. B. Green.— Report on Rocky Mountain locusts in Otter Tail County, Minn., in 1888. By 
Otto Lugger. July, 1888. 
4. Comparative value of cold and warm water for stock in food consumed and in the production of milk, 
butter, and beef. By E. D. Porter.— Fungi which killinsects, especially as affecting chinch bugs 
and locusts. Bv Otto Lugger.— "Tuberculosis" or consumption in domestic animals. By 
M. J. Treacy. Oct., 1888. 
5. Indian corn: Habits of root growth; methods of planting and cultivation; notes on ears and suckers. 
By W. M. Hays.— Propagation of Russian willows and poplars from hardwood cuttings; native 
plums; comparative tests of varieties of cabbage. By S. B. Green.— New method of potato cul- 
ture. By Charles Poumeroulie.— Frosted and rusted wheat. By Otto Lugger. Jan., 1889. 
6. Experiments with frosted, rusted, and stack burned wheat: Notes on the effects of frost and rust on 
the germination of wheat. Bv E. D. Porter.— Experiments in germination and growth of dam- 
aged wheat and barley. By S. B. Green. Feb., 1889. 
