72 



SCIENCE 



[N. S. Vol. LI. No. 1307 



eurred in the raw cream butter several weeks be- 

 fore it appeared in the butter from the pasteurized 

 cream. The oxidizing enzymes in raw-cream butter 

 apparently accelerate the catalytic activity of the 

 metallic salts which cause the production of typical 

 "tallowy" butter. It was found that over-neu- 

 tralization of the cream failed to accelerate mate- 

 rially the production of tallowiness by copper lac- 

 tate. This paper will appear shortly in the Jour- 

 nal of Dairy Science. 



The nutritive value of commercial corn gluten: 

 C. O. Johns, A. J. Tinks and M. S. Paul. 



The effect of calcium on the composition of the 

 eggs and carcase of the laying hen: G. Davis 

 Bttckner and J. H. Maetin. Authors have shown 

 that limiting the calcium supply of laying hens to 

 that naturally occurring in the foods fed, causes a 

 progressive thinning of the shell yet it does not 

 materially change the percentage composition of 

 the egg shells or their contents. The continued 

 laying of eggs under this condition causes a grad- 

 ual depletion of calcium in the carcase of the hen. 

 It would seem from the figures obtained that as 

 long as the economy of the hens permitted a forma- 

 tion of an egg shell that the contents of the sheU 

 would remain constant, thereby permitting an 

 average supply of calcium for the proper develop- 

 ment of the embryo of the chick. 



Protein requirement in tlie maintenance metabol- 

 ism of man: H. C. Sherman. (By title.) 



Tlie development of Tribolium confusum Duval 

 in certain foods : Eotal N. Chapman. This study 

 has shown that the confused flour beetle, Tribolium 

 confusum, grows at about the same rate in the dif- 

 ferent grades of wheat flour and in some of the 

 so-called wheat flour substitutes, but in certain of 

 the low grade wheat flours and in some of the 

 "substitutes" metamorphosis is retarded. The 

 rate of development in first middlings wheat flour 

 was adopted as the control. The instars were 

 plotted on the ordinate and the time in days on the 

 abscissa in such a way that the curve of develop- 

 ment would be a straight line bisecting the angle. 

 When the curves of development in other foods 

 were superimposed upon the controls they were 

 found to be very similar except for a prolongation 

 of the last larval instar. Since metamorphosis 

 takes place during the last instar, this prolongation 

 has been taken as a measure of the nutritive effect 

 upon metamorphosis. Certain low grade wheat 

 flours, rye flour and rice flour prolonged the last 

 instar while corn flour, steel cut oats and a syn- 

 thetic food prolonged all instars about equally. 



The influence of quinine on uric acid excretion in 

 man: H. B. Lewis and "W. L. McCluee. (By 

 title.) 



The uric acid content of normal human saliva: 

 H. B. Lewis and W. S. Griffith. (By title.) 



Further studies cm the chemical composition of 

 normal and ataxic pigeon brains: Mathilde L. 

 Koch and Oscar Riddle. A second series of 

 analyses made on brains of pigeons affected with 

 hereditary lack of control of the voluntary move- 

 ments shows deviations from the normal brain in 

 size and chemical composition. The brains are 

 smaller. Eight analyses made on cerebrums and 

 cerebellums show more pronounced changes in the 

 cerebellums. Data for the chemical changes in the 

 brain which accompany age have been obtained for 

 a series of ages in the pigeon. The new and 

 earlier evidence warrants the conclusion that chem- 

 ical diSerentiation does not proceed as rapidly in 

 the brain of ataxic birds as in the brains of normal 

 birds. 



A comparison of the distribution of various 

 chemical groups in parts of the human and pigeon 

 brain: Oscar Riddle and Mathilde L. Koch. 

 Separate analyses made of anterior and posterior 

 parts of the normal pigeon brain make it possible 

 to compare these with similar paits of the human 

 brain. It is found that the direction of the per- 

 centage differences in composition of the two parts 

 of the brain is the reverse of that of the human in 

 the case of every chemical fraction obtained. Also, 

 from a chemical standpoint the cerebellum of the 

 pigeon is an intermediate of the pigeon cerebrum 

 and the human brain (cerebrum and cerebellum). 

 The pigeon cerebrum is chemically least differen- 

 tiated, the human cerebrum most differentiated, of 

 the four organs compared. 



Charles L. Parsons, 



Secretary 



SCIENCE 



A Weekly Journal devoted to the AdveincemenE of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Adveincement of Science 



Published every Friday by 



THE SCIENCE PRESS 



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NEW YORK. N. Y. 



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