June, 1920] PHYSIOLOGY 417 



2842. Busolt, Krnst. Beitrage zur Kenntnis der Kohlenhydrate der Gemiisearten 

 [The carbohydrate of vegetables.] Jour. Landw. 64: 357. L916.] Mannitol was found in the 

 watery extract of asparagus, green beans, peas, cauliflower, and cabbage. Grape sugar was 

 found in cabbages, carrots, and green peas. Fructose and glucuronic acid were liberated 



from peas. [Based on Blanck's review in IJiedcriuaim's Zcntralbl. Agrikulturcliem. 47:287. 

 1918.] F. M. ScAei 



2843. Cobdley, A. B. Possible cause of "sour sap" in the Pacific Northwest. Better 

 Fruit 13": 6, 30-32. May, 1919.— See Bot. Absts. 3, Entry 2326. 



2S4-1. Esmabch, F. Zur Kenntniss des Stoffwechsels in blattrollkranken Kartoffeln. 

 [Metabolism in potato leafroll.J Zcitschr. Pfianzenkrankh. 29: 1-20. 1919.— See Bot. Absts. 

 3, Entry 2G30. 



2815. Folin, O., and E. C. Peck. A revision of the copper phosphate method for the 

 titration of sugar. Jour. Biol. Chcm. 38: 287-291. 1919. 



2S46. Haas, A. R. C. Colorimetric determinations of the hydrogen ion concentration in 

 small quantities of solution. Jour. Biol. Chem. 38:49-58. 1919. — Lacmoid paper was suc- 

 cessfully used for approximate determination of Ph values in small quantities of solution. 

 This may be supplemented by use of the spot plate method. The Ph values obtained by these 

 methods differ by 0.4 to 0.2 from those obtained by more exact methods such as the electro- 

 metric or the usual Sorensen colorimetric method. — George B. Rigg. 



2847. Hess, A. F., and L. J. Unger. The scurvy of guinea pigs. III. The effect of 

 age, heat and reaction on antiscorbutic foods. Jour. Biol. Chem. 38: 293-303. 1919. — Canned 

 tomatoes are an excellent anti-scorbutic. Boiling decreases, but does not destroy, their 

 efficiency. Under certain conditions orange juice loses its aptiscorbutic property when ren- 

 dered slightly alkaline. The same rule seems to hold for alkalinization as for heating; i.e., 

 the length of time the antiscorbutic food is subjected to the deleterious influence is fully as 

 important as the intensity of the process. — George B. Rigg. 



2848. Jennings, David S. Effect of certain colloidal substances on the growth of wheat 

 seedlings. Soil Sci. 7:201-215. 1919— See Bot. Absts. 3, Entry 2945. 



2849. Jones, H. M. A rapid hydrogen electrode method for determination of hydrogen- 

 ion concentration in bacterial cultures or in other turbid or colored solutions. Jour. Infect. 

 Diseases 25:262-268. 1919. — A new hydrogen electrode vessel is described which is easily 

 constructed, is accurate at least to 0.01 P H and gives rapid saturation with hydrogen gas. 

 A technic is described combining the indicator and the gas-chain methods, greatly simplifying 

 the procedure, especially where a large number of determinations are to be made. — Selman 

 A. Waksman. 



2850. Kendall, E. C. Isolation of the iodine compound which occurs in the thyroid. 

 Jour. Biol. Chem. 39: 125-147. 1919. 



2851. Kendall, A. I., A. A. Day, A. W. Walker, and M. Ryan. The fermentation 

 reactions of certain streptococci. XLII. Studies in bacterial metabolism. Jour. Infect. Dis- 

 ease's 25:189-206. 1919.— With the isolation of 356 cultures of organisms from cases of 

 pneumococcus pneumonia, from empyemas, blood cultures, and autopsies, and also obtained 

 from several institutions, the various organisms were compared in regard to their ability to 

 ferment certain carbohydrates and their derivatives. A relation exists between the stereo- 

 isomerism of members of the various groups of carbohydrates having the same empirical 

 formula, and their utilization by different types of bacteria. The fermentation reactions of 

 the bacteria afford a means of their identification. The bacteria, including the streptococci, 

 can therefore conveniently be classified into groups on the basis of fermentation reactions. 



