BOTANY. 615 



On the leucin resulting in pancreas digestion, R. Coiin (Ber. detif. chem. Ges., 

 S7,pp. 2727-27S2; ais. in Chem. Centbl., 1S94, IT, No. 25, p. DOS). 



The sugar resulting from indican, C. J. van Lf)EKKKEN {Landw. Vers. Stat., 45, 

 No. 3 and 4, pp. 195-200). 



Investigations on the coloring matter of huckleberries, R. IIeisk {Art. Eais. 

 Gcstiiid. Avit., {1S94), p. 478; abs. in Chem. Ztf/., IS {1S94), No. 102, liepert., p. 327). 



On the coloring matter of grapes, L. Sostkgni {Staz. Sper. Agr. Ital., 27 (1S94), 

 No. 4, pp. 400-41S). 



Concerning substances occurring in some fruits associated -with the "wax 

 substance, W. Skifkkt (Landw. Vers. Stat., 45, No. 1 and 2, pp. 29-30). 



A nevr constituent of American grapes and the -waxes of the latter, W. 

 Skifkut {Landn-. Fern. Stat., 4.',, No. 3 and 4, pp. 173-lSG). 



The ratio of dextrose to levulose in sweet w^ine and honey and the use of it 

 in determining the adulteration of these substances, J. KciNu; and W. Kakscii 

 (Ztschr. anahjt. Chem., 34 {1^-95), No. 1, pp. 1-19). 



The carrying out of Fehling's titration in Awii»e analysis, A. Uountkager 

 (Ztschr. anahjt. Chem., 34 (1S95), No. 1, pp. 19-25). 



Methods of analysis of must, M. Giunti and C. Bosciii {Staz. Sper. Agr. Ital., 

 27 {1S94), No. 4, pp. 376-SS5). 



Sulphurous acid in -wine, F. Sciiaffer, and A. Bertsciiinger (Schweiz. Wochen- 

 ..irhr. riiarm., 32, pp. 397-404; abs. in Chem. Centbl, 1S94, II, No. 24, pp. 958, 959).— 

 A careful study of the free and aldoliyde .snl]dmrou.s acid in wine. — w. D. bigelow. 



Results of the investigation of Swiss w^ines of 1893, A. Bkrtschingkr 

 {Schweiz. Wochensehr. Pharm., 32, p. 305; ref. Chem. Ztg., IS {1S94), No. 76, Beperl., 

 p. 228). 



On the reaction of iodin on starch, E. Duclaux {Ann. Inst. Pasteur, 8 {1S94), 

 No. 12, pp. S63-8G7). — A critical review. 



The preparation of litmus tincture, W. Schafer ( Jj;o//i-. Ztg., 9, j}- 839; abs. in 

 Chem. Centbl., 1S04, II, No. 2(1, /:. loGl). 



A shaking machine for phosphoric acid determinations, H. Wdowiszewski 

 (Ztschr. Stahl und IJisen, 13, p. 430; abs. in Ztschr. anahjt. Chem., 34 {1895), No. 1, p. 68). 



A stirring machine for precipitating phosphoric acid, A. Keller {Chem. Ztg., 

 17, p. 1070; abs. 'in Ztschr. anahjt. Chem., 34 {is;i5), No. l,p. 69). 



The chemical laboratory of St. Petersburg University {Chem. Ztg., IS {1SD4), 

 No. 97, p. 1903, Jigs. 2). 



BOTANY. 



A new reagent for the demonstration of hydrogen peroxid 

 in green plants, A. Bach {Ckmipt. Bend., 110 {l''^9i), No. 26, pp. 

 1218-1221). — The author lias found that an acid sohition of potassium 

 bichromate and anihn violet is a very sensitive reagent for the determi- 

 nation of hydrogen peroxid, II2O2, in the green parts of plants. It will 

 show the presence of 1 part in 1,400,000. The solution used contains 

 0.03 gm. potassium bichromate and 5 drops of anilin violet per liter. 

 Of this solution 5 cc. is placed in a test tube, to which 5 cc. of the solu- 

 tion to be tested and 1 drop of a 5 per cent solution of oxalic acid are 

 added. The presence of hydrogen peroxid will change the color of the 

 solution to a rose violet. For comparison, in another tube are placed 

 5 cc. of the solution, 5 cc. water, and a drop of the oxalic-acid sohition. 



In experimenting the method of procedure is to soak 25 gm. of green 

 leaves in a porcelain cup with 75 cc. of 1 per cent solution of oxalic acid. 

 The cup is covered with a saucer and set aside. From time to time 5 



