772 EXPEEIMENT STATION EEGOED. 



cm., and volmme content 2,337 cc.; of lot 2, 201.7 gm., 28.3 cm., 12 cm., and 

 1,842 CO., respectively. 



[Jacks and mules], J. J. Hoopeb and W. S. Anderson {Kentucky Bta. Bui. 

 116 (1913), pp. SS9-409, figs. 27).— Part 1 of this bulletin deals wltli the princi- 

 pal blood lines of jack stock in Kentucky, the feed, care, and management of 

 jacks and jennets, and methods of Judging. Parts 2 and 3 treat of the rearing 

 of mules, the best type of mare for producing mules, the feeding of mules, and 

 market requirements and type. 



Part 4 reports feeding experiments in which dried brewers' grains, although 

 not relished by mules, were consumed by them, as well as by horses, in grain 

 mixtures of cracked corn, rolled oats, and bran containing as high as 20 per cent 

 by weight of this feed. During the experiment the animals worked as hard and 

 as satisfactorily as they did before the brewery grains were fed them in such 

 large proportions. The dried brewers' grains proved to be slightly constipating. 



In an experiment comparing the relative value of corn and a mixed feed con- 

 sisting of cracked com, wheat bran, and oil meal 3 : 1 : 1, no noticeable difference 

 was observed in the health, spirit, or weight of the mules. Cotton-seed meal 

 was found to be not so palatable as oil meal. The skin and hair of mules fed 

 the grain mixture were more soft and glossy than those on ear corn, probably 

 due to the oil meal. 



It is stated that a great difference was noted in regard to the behavior and 

 efficiency of the 16 mules in the experiment. " The ones that were deep and 

 wide of barrel, large in bone, and closely coupled, showed the least loss of 

 weight on warm days when the work was unusually hard and prolonged. Such 

 mules were ready for their feed and were never ill-tempered. Some of the 

 other mules were long and shallow in body and light in bone, and the last rib 

 did not fit close to the hip. Such mules were fretful ; were off feed occasionally, 

 and lost in weight when unusual work was put upon them." 



Com versus oats for work mules, E. A. Trowbridge {Missouri Sta. Bui. 114 

 {191S), pp. 307-325, pi. i).— This bulletin reports experiments with 2 lots of 



2 mules, each fed by the reversal method during a period of 2 years, to determine 

 the relative feeding values of corn and oats. 



The lots were maintained in equally good health. The corn-fed mules kept 

 their weight slightly better than did the oat-fed mules. No difference was 

 shown in abihty to endure hard work or in spirit. The oat-fed mules required 



3 per cent more grain and 1.4 per cent more hay to maintain approximately 

 live weight than did the corn-fed mules. Six per cent more work was per- 

 formed by the corn-fed than the oat-fed mules. The mules fed corn and mixed 

 timothy and clover hay were maintained 28 per cent more economically than 

 those fed oats and mixed hay, when corn was valued at 50 cts, per bushel, oats 

 at 40 cts. per bushel, and hay at $10 per ton. 



The odd chromosome in the spermatogenesis of the domestic chicken, 

 Alice M. Boring and R. Pearl (Jour. Expt. ZooL, 16 (1914), No. 1, pp. 5S-83, 

 figs. 91). — The investigations of Guyer with Black Langshans, in which he 

 reported the presence of an X-chromosome, are cited, and it is pointed out 

 that if this X-chromosome is assumed to be a sex chromosome the male bird 

 must be heterozygous in regard to sex. 



The authors conducted an investigation in which material from the testes of 

 12 pure Barred Plymouth Rock and cross-bred males was used. From this they 

 conclude that '* there is no good observational or statistical evidence of the 

 existence of a sex chromosome in males of domestic chickens of the Barred 

 Plymouth Rock breed. In 11.82 per cent of first spermatocytes and 3.06 per 

 cent of second spermatocytes, there is a piece of chromatin similar to that called 

 an X-chromosome by Guyer in Langshan males. This is not to be regarded as 



