AGRICULTURAL CHEMISTRY. 733 



A new method for the quantitative estimation of sugar with the Zeiss 

 immersion refractometer, B. Wagneb and A. hi\< b {Chem. Ztg., SO 1906), No. 5, 

 Pi,. 88,39). The authors claim thai the use of the immersion refractometer for 

 determining sugar is more accurate, more rapid, and more economical of time and 

 jaaaterial than gravimetric methods. The possibilities of the method Eor the deter- 

 mination of calcium, aluminium, iron, zinc, etc., are also spoken of. 



Globulin, J. Mellanby {Jour. Physiol., SS I 1905), No. ', 5, pp. SS8 S7S,fig8. 16),— 

 SChe conclusions drawn from a series of investigations on the solution of globulin by 

 neutral Baits, the precipitation of globulin from such solutions, and related questions 

 Clow: 



'•Solutions"!' globulin by a neutral Ball is due to forces exerted by its free ions. 

 Ion< with equal valencies, whether positive or negative, are equally efficient, and the 

 efficiencies of ions of differenl valencies are directly proportional to the Bquares of 



their valencies. 



■•The a unt of globulin dissolved by a given percentage of neutral sail is directly 



proportional to the strength of the original globulin suspension. 



••The precipitation of globulin from solution in neutral salts by neutral salts 

 depends upon a molecular combination between the salt and globulin, the compound 

 ■0 formed being stable only in excess of the combining salt. Precipitation by salts 

 et the heavy metals depends upon the formation of a stable salt globulin compound. 



■•Solution of globulin by acids <»r alkalies is of the nature of a chemical combina- 

 tion. The relative solvent efficiencies of strong acids ami alkalies are of the same 

 order as their chemical avidities." 



The cleavage of edestin of cotton seed by pancreatic juice, E. Abdkrhalden 

 ami B. Reinbold {Ztschr. Physiol. Chem., 46 {1905), No. 1-2, pp. 159-175).— When 

 Heavage was induced by treating the edestin of cotton seed with pancreatic juice, 

 the proportion of dialyzable material not precipitated by phosphotungstic acid 

 increased with the time of the reaction, while the proportion of the material precipi- 

 tated by phosphotungstic acid increased at first and then decreased. Tyrosin, gluta- 

 minic acid, leucin, alanin, and aspartic acid and trytophan were isolated from the 

 cleavage products; also traces of phenylalanin. Xoglyeocoll nor a-pyrrolidin carbonic 

 acid was found. 



Carbon tetrachlorid with special reference to its use as a solvent in the 

 extraction of fat and in similar ways, B. M. Mabgosches I Der Tetrachlorkohlen- 

 sinij; water besonderer Berucksichtigung seiner Verwendung als Lbsungsbzw. Extrak- 

 mongmiitel in der Industrie der Fette wnd verwandter Gebiete. Stuttgart: Ferdinand Enke, 

 W05, pp. 115; rev. in Osterr. Chem. Ztg., 8 {1905), No. 24, P- 571). — A monograph on 

 carhon tetrachlorid summarizing the literature from a historical, chemical, and tech- 

 nological standpoint. The work as a whole constitutes a bibliography of the subject. 



A laboratory handbook for the analysis of milk, butter, and cheese, J. K. 

 Kvws i [New York], ,J. ed., }>/>. 60). — This is a brief outline of useful methods with 

 no attempt at interpreting results. The author states in the preface that "during 

 the past year a rigid investigation was undertaken for the purpose of determining 

 the comparative valueof the various 'milk testers.' with the resull that the lactoscope, 

 keamometer, pioscope, lactobutyrometer, and the lactometer, when used alone, were 

 found absolutely worthless in the testing of a milk." 



The application of 4 'sin-acid" butyrometry to sheeps', goats', and cows' 

 milk, C. Begeb {MUchw. Zentbl., l {1905), No. J .\ pp. 547-551).— Comparative 

 determinations by the < -ether and the Sichler non-acid methods <>n the three kinds of 

 milk are reported. 



Considerable difficulty was experienced in testing milk preserved with formalin by 

 the Sichler method. For ordinary purposes the non-acid method in its present form 

 is not considered as satisfactory as the (ierber method, and for the chemist the use 

 of acid as in the (ierber method can scarcely he considered a disadvantage. 



