140 Scientific Proceedings (113). 



marked diminution of power by alkali treatment but never any 

 where near so complete removal of the power as was obtained 

 with adsorbent agents. With yeast autolysate the reduction was 

 marked. With alfalfa extract it was not nearly so marked and in 

 some concentrations the results justify Fulmer, Nelson and Sher- 

 wood's view that alkali does not affect the stimulus. Their 

 conclusions would undoubtedly have been different had they 

 tested enough concentrations to see the trend of the curve. 



6. Experiments are given to further confirm the effect of 

 known vitamine B precipitants and adsorbents upon the stimula- 

 tory power of extracts and a new reagent for use in this connection, 

 viz., a carbon specially activated by Professor McKee, of the 

 Department of chemical engineering of Columbia University, 

 which was developed to adsorb basic substances. This substance 

 has the power to remove the stimulatory power from an extract 

 with the same efficiency as the Lloyd reagent, and when first 

 washed free of all adherent matter with water can by boiling with 

 glacial acetic acid be made to yield again its stimulatory material. 



From these experiments it seems to follow that the test is not 

 specific for Vitamine B as conducted by any of the methods now 

 cited in the literature. On the other hand it seems also to follow 

 that the vitamine B is not yet ruled out as one of the factors in 

 the stimulation and to justify further investigation to secure 

 an optimum medium for yeast comparable to those used in rat- 

 feeding experiments. 



66 (1648) 



The antiscorbutic property of raw, dried and cooked apples and 



bananas. 



By MAURICE H. GIVENS, H. B. McCLUGAGE and E. G. VAN HORNE. 



[From the Department of Physiology, University of Rochester, 



Rochester, N. Y.] 



Apples and bananas are the two most generally used of all 

 the fruits consumed by man in this country. The use of these 

 foods is advocated not only for healthy adults and infants 1 but 



1 Pease, M. C, and Rose, A. R., Am. J. Dis. Child., 1017, xiv, 379. 



