494 EXPERIMENT STATION RECORD. 



venison ami thf dark-red color of S(ininvl fiesh. In liirds, the groups of muscles 

 whieh are most used contain about 3.7 jier cent l)lood and those least use<l 1 to 1.6 

 per cent. The flesh of chicken is characterize<l l)y a very low hemoglobin content. 



The general conclusion is drawn that the blood content of striated muscle of warm- 

 blooded animals often dei)ends on the frequency and intensity of exercise. The 

 hemoglobin content <if the flesh of cold-blooded animals is discussed and other 

 related topics, incUiding the connection between hemoglobin content and the flavor 

 of flesh foods. The author states that in general, though not always, other soluble 

 bodies are present in abundance when the hemoglobin content is high. In other 

 words, the red nmscular tissues, generally speaking, have the most i)riinounced 

 flavor. 



On the time relations of proteid metabolism, 1'. B. Hawk {Amer. Jour. 

 Physiol., JO {190J), Xo. 3, pp. 115-14-^, figs. 4)- — Inexperiments with 2 men the time 

 relations of proteid metabolism were studied. After the ingestion of an extra 

 quantity of proteid it was found that the nitrogen excretion began to rise rapidly, 

 the point in maximum excretion being reached in 6 to 9 hours with one subject and 

 in 9 to 12 hours with the other, this point of maximum excretion being followed at 

 once by a very rapid fall which after a few hours gradually returned to the nornial 

 rate. The minimuni rate of nitrogen excretion for each subject was observed during 

 the night period. 



In general, the excretion of sulphur was parallel to that of nitrogen, the maximum 

 excretion occurring with each subject 6 to 9 hours after the ingestion of the proteid, 

 and the normal rate being regained in 24 hours. In the case of one subject a tendency 

 to 2 maxima daily was noted in the excretion of phosphorus. With the other sub- 

 ject a single maximum was generally observed, the normal level being regained with 

 each subject in the first period of the day following the experimental day in which 

 the extra proteid was taken at breakfast. 



The ratio of the nitrogen content of the urine to the heat of combustion of its 

 unoxidized material was somewhat lower on the day of extra iiroteid ingestion than 

 on normal days. 



Influence of rennin upon the digestion of the proteid. constituents of milk, 

 P. B. Hawk [Amer. Jour. I'hyxiol., 10 [1!->0S), No. 1, pji. J7-^6').— Artificial digestion 

 experiments led the author to conclude that rennin inhibits the digestion of milk 

 proteids and that rennin ash does not possess this property. The inhibitory action 

 of rennin upon the digestion of milk proteids was not modified by preliminary contact 

 with pepsin solution at 40° C. for 30 minutes. Paracasein was found to be somewhat 

 more difficult of digestion than casein. Rennin retarded the pancreatic digestion of 

 milk proteids in alkaline or neutral solution, but had no inhibitory action upon the 

 gastric digestion of fluid egg albumen. 



Results of tests ■with man and animals of 50 coal-tar colors, (t. W. Chlopin 

 {Ilyj. lliiii(hi-luiu, l-i {1903), Xo. !■'>, }>p. 7o3-7o6). — The author summarizes briefly 

 the results of an extended investigation of coal-tar colors from a hygienic standpoint, 

 the results of which have not yet been published in detail. Experiments of 8 to 14 

 days' duration were made with dogs, in which 1 to 3 gm. of the different colors 

 studied were introduced into the stomach daily. 



The effect of the colors on human skin was also studied, subjects wearing on the 

 hands or feet for 10 or 14 days woolen or cotton bandages colored with the dyes 

 studied. Fifteen colors, or 30 per cent of the dyes studied, are regarded as poisonous, 

 since they caused the death of the dogs or marked symptoms of poisoning. Seven 

 of these 15 colors belong to a group whose constitution is not known, namely, the 

 so-called Widal colors containing sulphur. Forty per cent of the dyes were regarded 

 as harmful since they caused serious functional disturbances, as vomiting, diarrhea, 

 or the excretion of albumin in the urine. 



