V.' 



70 ScientiJiG Intelligence. 



experimental investigation of the excretory products found in 

 phlorhizin diabetes. In the latter he finds no increase in the 

 output of phenol, indol or glycuronic acid. Langstein has con- 

 tinued his study of the end-products of peptic digestion on crys- 

 tallized egg-albumin. The compounds thus far definitely isolated 

 include : leucin, tyrosin, phenylalanin, glutamic and aspartic 

 acids, cystin, lysin, pentamethylendiamin, oxyphenylethylamin 

 and a nitrogenous carbohydrate. The differences between peptic 

 and tryptic digestion thus appear to be largely quantitative 

 rather than qualitative in kind ; although in peptic digestion the 

 biuret reaction persists. Neubekg and Blumenthal report the 

 formation of isovalerylaldehyde and acetone from gelatin. Biel- 

 FELD, in an investigation of the iron content of the liver, found 

 that the liver cells of women are, as a rule, decidedly poorer 

 in iron than those of men. These differences do not appear 

 until the age of 20 to 25. Magnus-Levy has published the 

 results of a comprehensive and interesting investigation of 

 acid formation during the autolysis of the liver, under aseptic 

 and antiseptic conditions. The non-volatile acids thus obtained 

 include two lactic acids and succinic acid ; the non-volatile acids 

 formed are : formic, acetic and butyric acids. The gases H, H^S 

 and CO2 also arise. The application to our knowledge of certain 

 pathological conditions is pointed out. l. b. m. 



II. Geology and Natural History. 



1. United States Geological Survey. Examination of Forest 

 Reserves and Adjacent Regions ; by Hexry Gannett. 21 Ann. 

 Report, Pt. V, 711 pp. ; 143 pis.; maps in accompanying port- 

 folio. This report includes descriptions of seven reserves and 

 wooded areas in different parts of the United States. 



2. Mineralogie de la France et de^ses Colonies. Description 

 physique et chimique des Mineraux; Etude des Conditions geol- 

 ogiques de leurs Gisements ; par A. Lacroix. Tome troisieme, 

 l*^"" fascicule, pp.^ 1-400. Paris, 1901 (Librairie Polytechnique, 

 Ch. Beranger, ^diteur). — After an interval of nearly four years, 

 the second volume of this most valuable work is now followed by 

 the third. It contains the Oxides, Hydroxides, Nitrates, Plom- 

 bates and Manganites. A fourth volume, which is promised soon, 

 will comi^lete the whole. To the mineralogist, who is acquainted 

 with the admirable features of the preceding volumes, it is un- 

 necessary to say more than that the part now issued is carried 

 through on the same plan and with like success. 



3. Size of Grain in Igneous Rocks in relation to the distance 

 from the Cooling Wall: by Augustin L. Queneau. Contribu- 

 tions from Geol. Dept. Columbia University, vol. ix. No. 80, pp. 

 181-195. — The Palisades (Triassic Diabase) and the minette dike 

 of Franklin Furnace, N. J., were chosen as fields for the study 

 of the causes of variation in size of grain in igneous rock. The 

 method used is based on Lane's work (Geol. Survey Mich., vol. 

 vi), and the mathematical treatment upon the general theory of 

 cooling presented by R. S. Woodward (Annals of Math., vol. iii). 



