6 
BUL. 1199 (SUP. 1), U. S. DEPARTMENT OF AGRICULTURE. 
Iowa Agricultural Experiment Station, Ames. 
BULLETINS. 
. Sunshine and sanitation for hog houses. W. A. Foster and J. M. Evvard. Jan., 
1921. 
. Preparation of corn for dairy cows. A. C. McCandlish and G. E. Weaver. Jan., 
1924: 
. Controlling downy mildew of lettuce. A. T. Erwin. Jan., 1921. 
. The cost of producing milk. H. B. Munger. Jan., 1921. 
. lowa farm management surveys, Blackhawk, Grundy, and Tama Counties. H. B. 
Munger. Mar., 1921. 
. Grape production and distribution in western Iowa. T. J. Maney. July, 1921. 
. Cooperative livestock shipping in Iowa in 1920. E. G. Nourse and C. W. Ham- 
mans. July, 1921. 
. A comparison of silage and soiling crops for summer milk production. A. C. 
McCandlish. July, 1921. 
. Breeding Rhode Island reds for type and egg production. H. A. Bittenbender. 
Jan., 1922; 
. Seed analyses, 1913 to 1921. L. H. Pammel and C. M. King. Dec., 1921. 
Soybeans as a home-grown supplement for dairy cows. A. C. McCandlish, G. E. 
Weaver and L. A. Lunde. Feb., 1922. 
. The onion thrips [Thrips tabaci Lindeman] in Iowa. J. L. Horsfall and F. A. 
Fenton. Mar., 1922. 
. Potato growing in Iowa as affected by temperature. A. T. Erwin and R. A. Rud- 
nick. Mar., 1922. 
. Influence of acidity on flavor and keeping quality of butter. Martin Mortensen. 
Aug., 1922. 
. Self-feeders for swine. J. M. Evvard, J. B. Davidson, and W. A. Foster. Novy., 
1922. Also abridged edition. 
. Accounting records for livestock shipping associations. Frank Robotka. Noy., 
1922. Also published as U. S. Dept. Agr. Bul. 1150. 
RESEARCH BULLETINS. 
. The relation between the volatile and total acidity in starters and in cultures of 
S. lacticus. W. A. Cordes and B. W. Hammer. July, 1921. 
. Sources of the flavor in butter. B. W. Hammer. July, 1921. : 
. Burnt or caramel flavor of dairy products. B. W. Hammer and W. A. Cordes. 
July, 1921. 
. A study of the control of crown gall on apple grafts in the nursery. I. E. Meihus 
and T. J. Maney. July, 1921. 
The acid-base balance in animal nutrition: I, The effect of certain organic and 
mineral acids on growth, well-being and reproduction of swine; II, metabolism 
studies on the effect of certain organic and mineral acids on swine. A. R. 
Lamb and J. M. Eyvard. July, 1921. 
. The acid-base balance in animal nutrition: III, Effect of addition of alkalies to 
the ration on growth and well-being of swine. A. R. Lamb and J. M. Evvard. 
July, 1921. 
. Alternate hosts and biologic specialization of crown rust in America. I. E. Melhus, 
S. M. Dietz and Florence Willey. Jan., 1922. 
. Influence of age at the time of freshening on production of dairy cows. A. C. 
McCandlish. <Aug., 1922. 
SOIL SURVEY REPORTS. 
. Wapello County. W. H. Stevenson, P. E. Brown, L. W. Forman and E. I. Angell. 
Jan., 1921. 
. Wayne County. W. H. Stevenson, P. E. Brown, L. W. Forman, D. S. Gray and 
P. C. Weichman [i. e. Wiechmann ?]. Apr., 1921. 
. Hamilton County soils. W. H. Stevenson, P. E. Brown, L. W. Forman and Knute 
Espe. July, 1921. 
. Louisa County soils. W. H. Stevenson, P. E. Brown, L. W. Forman and J. A. 
Elwell. <Aug., 1921. 
. Palo Alto County. W. H. Stevenson, P. E. Brown, A. M. O’Neal, jr-., L. W. Forman 
and W. G. Baker. June, 1922. 
. Winnebago County soils. W. H. Stevenson, P. E. Brown, L. W. Forman, W. G. 
Baker and G. H. Artis. June, 1922. 
