66 EXPERIMENT STATION BECOED. (Vol.38 



Results of breeding experiments with gipsy moths are cited which are inter- 

 preted to show (1) that two nearly related forms, both normal in regard to 

 sex-inheritance, produce if crossed in one direction normal offspring, in the 

 other direction normal males and intersexual females; (2) that the degree of 

 intersexuality is definite in a given cross, but different in different crosses; 

 (3) that intersexuality shows Mendelian segregation; and (4) that males 

 may become intersexual in certain crosses. Both sexes contain the anlage for 

 either sex. In both sexes, irrespective of the zygotic constitution, both anlages 

 might become patent. Which one is to appear depends entirely upon the 

 quantitative relation of both. 



The control of sex, A. Moeosini (Nuovi Ann. Agr. Siciliana, 6. ser., 4 {1915), 

 No. S, pp. 162-169; abs. in Internat. Inst. Agr. [Rome], Intemat. Rev. Sci. and 

 Pract. Agr., 7 (1916), No. 3, pp. S98, 399). — The author summarizes the more 

 important hypotheses advanced on the subject of the determination of sex, and 

 reports results of laboratory experiments on the nature of the sex cells. He 

 concludes that sexual dimorphism can not result from the action of the same 

 factors in all species, and that the real crux of the question must be sought in 

 various circumstances which, according to the particiilar case, act on the 

 metabolism, and consequently also on the sexual differentiation. 



Combining the more important factors which other biologists have applied 

 separately in each case, the author announces that he has succeeded in obtain- 

 ing for a long series of generations of different pairs of animals, litters 

 exclusively unisexual, first all males and then entirely females from the same 

 parents. 



A m.ethod of calculating food values, H. Suchting {Jour. Landw., 6If 

 {1916), No. S, pp. 173-180). — A method is proposed of estimating the value of 

 a food based on 1,000 calories as a unit, and with a comparative value of 1 kg. 

 starch equal to 4,000 calories. It is claimed that this unit, while not exact, 

 is simpler and more practical than the starch unit proposed by Kellner. It is 

 deemed more practical to determine the value in terms of fuel rather than in 

 terms of one of the components of the food as starch. As the starch content 

 varies in foods it widens the limit of error. The digestible food values he 

 would express in heat units. 



In estimating the value of a food, instead of reducing the digestible nutrients 

 to starch values he would place 1 kg. each of protein, fat, and nitrogen-free 

 extract as equal to 4, 9, and 4 Kellner values, respectively. 



The composition of some fodder grasses of German East Africa, F. Hon- 

 CAMP and H. Zimmermann {Landw. Vers. Stat., 87 {1915), No. 4-5, pp. 351- 

 S6S). — Food analyses of the following plants are given, together with a dis- 

 cussion of their range and botanical characteristics : Eragrostis superha, E. 

 minor, Pappophorum scabrum, Sporobolus robustus, S. spicatus, 8. rehmanii, 

 Aristida adscensionis, Ci/nodon plecto stachyum, Chloris virgata, C. m/yrio- 

 stachya, C. gayana, Dactyloctenium cegyptiacum, Leptocarydium alopecuroide8, 

 Digitaria horizontalis, and Pennisetum dliare. 



Comparative value of concentrated protein meals for dairy cattle, sheep, 

 and swine, E. S. Abchibaxd {Agr. Oaz. Canada, S {1916), No. 8, pp. 687-692). — 

 This experiment was undertaken to compare the palatability and nutritive 

 \alue of linseed-oil cake, cottonseed meal, gluten feed, fish meal, and peanut-oil 

 meal. 



All the feeds were found to be palatable. Their relative values at local prices 

 were based upon gluten meal at $32 per ton. The following table gives the 

 comparative standing of the various feeds, with the several classes of animals 

 under experiment; 



