664 EXPERIMENT STATION RECORD. 



food, the digestive and metabolic processes involved in the maintenance of the 

 body, etc. Descriptions are also given of various types of apparatus which have 

 been used in the study and measurement of energy metabolism and respiratory 

 exchange. 



The biochemistry of respiration, PI. M, Vernon (8ci. Prog. Twentieth Cent., 

 9 (1914), No. 3Jf, pp. 251-269). — ^A summary and digest of data regarding this 

 subject, from vphich the author draws the general conclusion that the biochem- 

 istry of respiration is in the main dependent upon intracellular enzyms. "While 

 in some instances this is entirely a hydrolytic process without oxidation, in a 

 niajority of organisms the jirocosses are both hydrolytic and oxidative. 



Body temperature and pulse rate in man after muscular exercise, E. G. 

 Martin, C. M. Grubeb, and T. H. Lanman {Avier. Jour. Physiol., 35 {1914), 

 iNo. 2, pp. 211-223, fig. 1). — Experiments with an athlete and an untrained man 

 were conducted for the purpose of ascertaining the relationship between body 

 temperature and the cardio-acceleration of exercise. Aftei' muscular exercise, 

 comparisons of axillary temperature and pulse rate were made, leading to the 

 conclusion that no definite parallel exists between persistent cardio-acceleration 

 following exercise and heightened body temperature. 



A comparison of the effects upon the blood pressure of physical fatigue 

 produced by prolonged marching with that produced, by psychic fatigue 

 resulting from continued mental effort, J. M. Lahy {Compt. Rend. Acad. Sci. 

 [Paris'], 158 (1914), No. 25, pp. 1913-1916). — Measurements of blood pressure 

 were made upon soldiers making long daily marches, scientists working in the 

 laboratory, and stenographers working industriously for seven hours. A com- 

 parison of these figures before and after work showed that in general physical 

 fatigue produced a diminished blood pressure while mental effort increased 

 the blood pressure. 



Influence of the environment on the heat production of the human body, 

 WoBSA (Arch. Hyg., 83 {1914), No. 3-4, pp. 123-154). — A mathematical treatise 

 of heat as applied to the maintenance of normal body temperature is given. It 

 is suggested that heat nerves constitute a part of the central heat regulating 

 system. 



Energy metabolism under conditions of chronic raaluutrition, P. Hari 

 {Diochcm. Ztsclir., 66 {1914), No. 1-3. pp. 20-47).— Respiration calorimeter ex- 

 periments were made with laboratory animals (dogs) which had previously 

 undergone a fasting period. The experimental periods varied in length from 

 20 to 22 hours and were carried out at a temperature of 27 to 29" C. Measure- 

 ments were made of the energy production and of the nitrogen and carbon 

 balance. 



The metabolism of a dog receiving a daily ration of milk insufficient to meet 

 his energy requirements showed either a slight increase or else a gradual 

 apparent decline. A slight increase in energy metabolism was noted In the case 

 of dogs which showed a relatively small loss of protein in the preceding fasting 

 period as well as during the period of malnutrition. In the case of animals 

 showing a considerable loss of protein a decrease in energy metabolism was 

 observed, but a total milk diet tended to prevent this diminished metabolism. 



The specific dynamic action of milk was demonstrated in the case of such 

 animals as had suffered a loss of protein and showed a decrease in energy pro- 

 duction. Owing to the marked decrease in the metabolism necessary for main- 

 tenance, it is deemed conceivable that the increase of energy metabolism 

 brought about by the ingestion of milk can not make itself evident during the 

 24-hour heat production period. 



