1914] Isaac King Phelps 447 



The various divisions of the brain contained the same kinds of 

 enzymes, but in different amounts. The cerebrum extract was sev- 

 eral times as active as that of the medulla. Gray matter is much 

 more active than white matter. 



The carbon dioxid excretion as modified by body weight. G. 

 O. HiGLEY. (Physiol. Lab., Univ. of Mich.) This work was done 

 with apparatus previously described.^ There were nineteen sub- 

 jects, students in the Univ. of Mich. The subjects, who had been 

 engaged in lab. work for several hours preceding the experiments, 

 recHned for 15 min. preceding the putting on of the mask and the 

 beginning of the record. The average excretion of carbon dioxid 

 per kilo of body weight was 6.3 mg. Wide departures from this 

 value seemed to be due to ( i ) an excessive amount of adipose tissue 

 in the body of the subject giving low results, and (2) colds and indi- 

 gestion giving high results. 



Methods adapted for the determination of decomposition in 

 eggs and in other protein food products. H. W. Houghton 

 AND F. C. Weber. (Bur. of Chem., U. S. Dep't of Agric.) The 

 methods that are most applicable for the determination of decom- 

 position are the Polin titration and nesslerization methods for free 

 ammonia, Klein's modification of Van Slyke's method for amino 

 nitrogen, and the Folin-Wentworth method for acidity of fat. Cal- 

 culating the results on liquid eggs to a moisture-fat free basis, the 

 following amounts of ammonia nitrogen in mg. per 100 gm. of mate- 

 rial were obtained: By the Folin titration method — seconds, 11.4; 

 spots, 14.1; Hght rots, 17.3; rots, 26.2; black rots, 169.6. By the 

 Folin-nesslerization method — seconds, 12.4; spots, 20.0; light rots, 

 21.5; rots, 29.9; black rots, 148.6. 



The amino nitrogen determination is of Service in detecting 

 liquid and dry blood rings, spots and light rots. Increase in the 

 acidity of the fat indicates spots and worse grades of eggs. 



The ammonia methods applied to herring give results indicating 

 decomposition of the fish after standing 24 hours at about 70° F. 

 Applied to clams, an appreciable increase in the ammonia is shown 

 after keeping two days at a temperature of 60° F. to 65° F. 



Nephelometry in the study of nucleases. P. A. Kober and 



3 Higley and Bowen : " The carbon dioxide excretion resulting from bicyc- 

 ling"; Amer. Jour. of Physiol, 1904, xii, p. 311. 



