1917] DAIRY FARMING DAIRYING. 571 



14 cts. per dozen. In this contest it required an average of 4.27 lbs. of masii 

 and grain to produce 1 lb. of eggs. Data with reference to egg production, 

 feed, temperature, etc., are tabulated. 



How to operate an incubator, J. E. Dougherty {California Sta. Circ. 156 

 {1916), pp. 8, figs. S). — Detailed directions are given. 



DAIRY FARMING— DAIRYING. 



Journal of the British Dairy Farmers' Association {Jour. Brit. Dairy 

 Farmers' Assoc, 30 (1916), pp. 257, figs. 7). — This contains articles by various 

 authors on milk recording in Great Britain, milk substitutes for calves, dairy- 

 ing of the future, dairying in New Zealand, fluctuations in the fat content of 

 milk, the world's progress in dairying, the milking trials of 1915, and other 

 dairying topics. 



Twenty-sixth, twenty-seventh, twenty-eighth, and twenty-ninth annual 

 reports of the Bernese Dairy School at Riitti-Zollikofen, A. Peter et al. 

 i-fahresber. Molk. Schule Riitti-ZoUikofen, 26 {1912-13), pp. 70, pi. 1; 27 

 (1913-lJ,), pp. 58, pi. 1, figs. 3; 28 {19H-15), pp. 100, pi. 1; 29 {1915-16), pp. 88, 

 figs. 7).— These are the usual reports (E. S. R., 2S, p. 372). 



The first-named also includes a discussion of the preparation of rennet, 

 analytical data on the examination of milk by determination of the refractive 

 index, analytical data obtained by the examination of milk by determining the 

 specific gravity of the calcium chlorid serum, and the results of tests of a 

 number of mechanical appliances. 



The second report gives the results of some tests with a mechanical butter 

 machine, a practical cheese test with a commercial coagulant, the use of fish 

 meal as a feed for swine in conjunction with dairy waste, and the separation 

 of cream by centrifugation. 



The third report contains experimental results on the use of aluminum con- 

 tainers and the calculation of the food value of dairy waste in the feeding of 

 swine. 



The last report contains experimental work on the detection of milk adul- 

 teration by watering and analysis of butter and the results of tests of a number 

 of mechanical appliances used in the dairy industry. 



Experiments in the feeding of dairy cows, J. Dunlop and P. W. Bailey 

 {Midland Agr. and Dairy Col., Rpt. Expts. Feeding Dairy Coics [i9io], pp. 

 16). — In each of the three experiments here reported, each of which lasted for 

 six weeks, eight Shorthorn cows were fed by the reversal system. The first 

 and fourth weeks of each experiment were allowed for the cows to become 

 accustomed to the rations. 



In a comparison of hemp-seed cake and linseed cake the cows were fed a 

 basal ration of cabbage, hay, straw, mixed grain, and Egj'ptian cotton-seed cake. 

 In addition they received either 4 lbs. of linseed cake or 4 lbs. of hemp-seed cake 

 per head daily. During the four weeks of the experiment proper the cows on 

 linseed meal gained 58 lbs. in weight and produced 2,043.5 lbs. of milk, con- 

 taining 3.8 per cent of fat. On hemp-seed meal they gained 4 lbs. in weight 

 and produced 2,073 lbs. of milk, containing 3.75 per cent of fat. There was no 

 difference in chui-nability of the milk or in flavor of the butter in favor of 

 either of the rations. The hemp-seed cake had a slightly constipating effect 

 upon the cows. 



In a test comparing dried yeast with decorticated cotton-seed meal the cows 

 were fed the same basal ration as in the above test and in addition either 

 3 lbs. of dried yeast or 3 lbs. of decorticated cotton-seed meal per head daily. 

 On the dried yeast ration the cows gained 56 lbs. in weight and produced 



