ANIMAL PE0DUCTI01!7. 569 



Some notes on the form of the curve of carbon dioxid excretion result- 

 ing from muscular work following forced breathing, G. O. Higley {Biochem. 

 Bui., 2 (1913), No. 7, pp. 390-392, pi. 1). — In the case of one of the two subjects 

 studied the curve for rate of excretion of carbon dioxid returned during the 

 period of forced respiration to practically the original value. 



" With the other subject the return was less perfect. It would seem that as 

 a result of the additional work of the respiratory organs a return of the rate 

 of excretion to the value during normal respiration could not be expected." 



The influence of barometric pressure on carbon dioxid excretion in man, 

 G. O. Higley (Biochem. Bill., 2 (1913), No. 7, pp. 393-If02, pi. i).— According to 

 the author's summary of his results, there were indications of an influence of 

 barometric change on the carbon dioxid excretion of one of his 3 subjects and 

 a slight lufluence in the case of another. With the third, negative coeflicients 

 were obtained. 



" The barometric change is evidently a minor influence and its effect is there- 

 fore liable to be masked by other influences, such as exercise, amount and char- 

 acter of meals, etc." The effect upon muscular endurance noted by another 

 observer was not verified. " The writer is of the opinion that if a series of 

 parallel ergographic and respiration experiments were made on a number of 

 subjects, it would be found that positive effects of barometric changes on muscu- 

 lar endurance are accompanied in general by positive coefficients of correlation 

 of barometric change with rate of excretion of carbon dioxid." 



Calorimetrical experiments on warm-blooded animals, A. V. and A. M. 

 Hill (Jour. Plujsiol., ^6 (1913), No. 2. pp. 81-103, figs. 3).— A detailed descrip- 

 tion is given of a respiration calorimeter designed for experiments with small 

 animals. 



The calorimeter consists essentially of a Dewar flask which contains the 

 animal under observation and a water coil for carrying away the heat pro- 

 duced by the animal. The amount of heat gained by the water in passing 

 through the calorimeter is measured by means of a thermopile and recorded 

 upon an automatic registering galvanometer, thus giving a continuous record of 

 the heat produced by the subject. 



In experiments with fasting animals it was found that the ratio of heat pro- 

 duction to body weight was quite constant for animals which were more than 

 one-third the size of a full grown animal. In the case of smaller animals the 

 heat production per gram rose rapidly as the animals decreased in weight. It 

 was found that animals kept together in twos or threes showed a smaller heat 

 production per gram of body weight than when they were kept separately. This 

 was probably due to the fact that the animals were less active under these 

 conditions. It is suggested that this fact may be of importance in the nutrition 

 of young animals since, with a given diet, if the heat production is less when the 

 animals live together they will grow faster under these conditions. 



ANIMAL PRODUCTION. 



Some new or little-known leguminous feeding stuffs (Bui. Imp. Inst. 

 [So. Kensington], 11 (1913), No. 2, pp. 230-243) .—Analyses are reported of a 

 number of comparatively new leguminous feeding stuffs, including beans from 

 the Sudan, pigeon peas, velvet beans, lentils, etc. 



Monketoon melons as a cattle food, B. W. L. Noaks (Rhodesia Agr. Jour., 

 10 (1913), No. 5, pp. 726, 727).— A comparison is made of the feeding value of 

 Monketoon and the American stock melons in which the former is reported as 

 showing a moisture content of 92.39, protein 0.74, and fat 0.75 per cent, and a 



