470 EXPERIMENT STATION RECORD. 



1915, but fell $5 in average price during the year, the average value now being 

 $131. The percentage of pure-bred sires is increasing. Notable progress is 

 reported in the quality of horses as the result of the enactment of the stallion 

 law in 1906. 



A directory of owners of public service stallions and jacks constitutes the 

 bulli of the bulletin. 



Farm poultry, M. A. Jtjll {Quebec: Maedonald College, 1915, pp. 95, figs. 

 91). — A practical treatise on the breeding, feeding, care, and management of 

 poultry for marli:et purposes. An article on external parasites of poultry by 

 W. Lochhead is included. 



Measurement of the winter cycle in the egg production of domestic fowl, 

 R. Peakl (U. S. Dept. Agr., Jour. Agr. Research, 5 {1915), No. 10, pp. 429-4811).— 

 Continuing previous work (E. S. R., 31, 570), the author presents evidence 

 from studies at the Maine Experiment Station tending to show that with flocks 

 of poulti-y having average hatching dates falling somewhere within the month 

 of April " the correlation between the egg production to March 1 of the pullet 

 year as one variable and the egg production up to the time when the individual 

 is 300 days of age as the second variable is extremely high. The mean produc- 

 tion to ]\Iarch 1 is, in general, higlier than the mean production to 300 days of 

 age. The production to March 1 is a relatively less variable measure (as 

 indicated by the coeflicient of variation) than the production to 300 days of 

 age. 



"The conclusion that the 300-day production would be a better measure of 

 the winter cycle of fecundity than the production to March 1 is not warranted 

 by the facts. Whatever superiority tliere is of one of these measures over the 

 other is entirely in favor of the production to March 1. The justification for 

 the employment of the winter cycle of production as an index of imiate fecundity 

 capacity or ability is a distinct and separate problem which has been discussed 

 at length in earlier papers." 



A bibliography of literature cited is include<l. 



Report of the third international egg-laying contest [from October 28, 

 1913, to September 27, 1914], J. R. Tebrt {Brit. Columbia, Dcpt. Agr., Live 

 Stock Branch, Rpt. Internat. Egg-Laying Contest, 3 {1914), PP- 2S, figs. 11).— 

 An account of the egg production, cost of production, profits, and other items 

 relating to the various breeds at this contest. 



Process for the preservation of eggs, H. L. S. Loft {English Patent 19,721, 

 Sept. 12, 1914; ahs. in Jour. Soc. Chcm. Indus., S4 {1915), No. 20, p. 1068).— 

 " Eggs are placed in a closed vessel and subjected for two hours to the action 

 of a mixture of air and formaldehyde at 35° C. [95° F.] ; If desired, steam 

 may also be admitted. The temperature is then lowered and maintained at 

 10° for 30 minutes, after which the eggs are coated with a suitable substance, 

 e. g., melted paraffin wax." 



DAIRY FARMING— DAIRYING. 



Raising dairy heifers; Cost, feeding, and care, C. C. IIayden {Ohio Sta. Bui. 

 2S9 {1915), pp. 30, figs. 5). — Data for two years were collected on the cost of 

 producing a dairy heifer at the station under Ohio conditions. The average 

 birth weight of the Jerseys was 56 lbs. and that of the Holstein-Friesians 82 

 lbs. In records kept of 40 Jersey heifers and 29 Holstein-Friesian heifers from 

 birth to 1 year of age it was found that the Jerseys made an average daily gain 

 of 1.1 lbs. at a feed cost of $27.75 and a net total cost of $42.54. The Holstein- 

 Friesians made a daily gain of 1.3 lbs. at a feed cost of $29.31 and a net total 



