1106 EXPERIMENT STATION RECORD. 



produced from the latter by the ferment-like action of enterokinase. There is no 

 evidence that the enterokinase is essential to or takes any part in the proteolytic 

 activities of trypsin.' 1 



The physiological role of glycogen [Rev. Prang. Med. et Chirurg., 1904, No. 35; 

 abs. in Rev. Soc. Sci. Hyg. Ailment., 1 (1904), No. 3, pp. 279-281). — According to the 

 author's summary glycogen has two important properties — first, it is a source of 

 energy and a powerful exhaustive of functional activity, and second, it has antitoxic 

 properties. 



The influence of food on respiratory combustion, Laulaxie (Compt. Rend. 

 Soc. Biol. [Paris}, 57 (1904), Nos. 35, pp. 548-551; 36, pp. 579-584; 58 (1905), No. 3, 

 pp. 115-1:1 1. — Data are reported regarding the effect's of different classes of food on 

 the consumption of oxygen. 



As shown by the amount of oxygen consumed in tests with dogs, combustion 

 in the body is much increased 3 hours after taking food; in fact, the increase is 

 noticeable immediately after eating. Except with small rations (400 gin. of meat), 

 the intensity of combustion increased to the twelfth hour, when it reached its maxi- 

 mum. It then decreased, reaching a minimum 24 hours after food was taken. In 

 the case of sugar the maximum combustion was found in 3 hours. It is apparent, 

 therefore, that combustion in the body depends upon the quantity and quality of 

 the food taken, and the author believes it fair to conclude that oxygen consumption 

 is a measure of the work of digestion. 



A method of determining a maintenance ration is proposed which depends upon a 

 comparison of the oxygen actually required and the theoretical amount, that quan- 

 tity of food being sufficient for maintenance which shows in 24 hours an actual 

 oxygen consumption just equal to the theoretical value required for complete com- 

 bustion of the food, body weight being maintained. 



In a test reported, which was made with a dog weighing 15 kg. fed horse meat, 

 the oxygen consumed ranged from 120.128 liters when fasting to 278.626 liters when 

 2,000 gin. was eaten. The theoretical amount of oxygen necessary for the consump- 

 tion of the food ranged from nothing to 500 liters. The corresponding difference 

 between the theoretical and actual amounts of oxygen ranged from —120.128 to 

 • 221.374. Platting the curves of the results obtained the author calculates that 

 620 gm. of meat represents the quantity at which oxygen equilibrium would be 

 reached. In a similar experiment in which milk soup was fed the amount required 

 for maintenance was calculated to be 387.32 gm. The value of this method is 

 discussed. 



On the interrelationship of calcium and magnesium excretion, J. Malcolm 

 (Jour. Physiol., 32 (1905), No. 2, -pp. 183-190). — The experiments reported were made 

 with dogs. According to the author, "considerable evidence is brought forward to 

 show that the ingestian of soluble magnesium salts causes a loss of calcium in adult 

 animals and hinders its deposition in young growing animals, while soluble calcium 

 salts do not in the same way affect the excretion of magnesium." 



Practical exercises in chemical physiology and histology, H. B. Lacey and 

 C. A. Paxxett (Cambridge: W. Heffer & Sons; London: Simpkin, Marshall & Co., 1904, 

 l>t>. 11:: rev. In Lancet [London], 1905, I, No. 14, p. 936). — A compilation of practical 

 exercises in chemical physiology and histology, designed for the use of students. 



ANIMAL PRODUCTION. 



The composition of Ontario feeding stuffs, W. P. Gamble | Ontario Agr. Col. 

 and Expt. Farm Bui. 138, pp. 32). — With the object of securing data regarding the 

 composition and quality of local feeding stuffs, samples of by-products were collected 

 from flour, oat, pea, and starch mills, and from other sources. Some samples of 

 proprietary feeds and staple feeding stuffs were also collected. 



