November 14, 1913] 



SCIENCE 



709 



with various menstrua, assaying for fixed content 

 and alkaloidal strength and testing Inseeticidal 

 value on bed-bugs indicate that this preparation 

 owes its inseeticidal value more to the fixed oil 

 content than to its alkaloidal strength. 



H. V. Akny and H. H. Schaefeb: The Ferric 



Alum Estimation of Casein. 

 ■Charles Baskerville: Some Physico-chemical 

 Considerations in Reference to Inhalation Anes- 

 thetics. 

 F. O. Taylok: Amyl Nitrite, Its Preparation, 



Purity and Tests. 

 Louis Hogrefe: The Chemico-legal Interpretation 

 of United States Pharmacopoeia. 

 Deals with the interpretation of the National 

 Pure-food Law, wherever it is based on the United 

 States Pharmacopoeia, especially with the inter- 

 pretation of the term "drug" as defined by the 

 law, and as understood by the TJ. S. P. Also the 

 interpretation of ' ' adulteration ' ' as defined by the 

 law. The paper also considers the tests laid down 

 by U. S. P., and their interpretation according to 

 law. Taken as a whole the paper is a brief of 

 see. 6 and sec. 7 of the pure-food law, as con- 

 etrued by the writer, alike a member of the legal 

 profession and the profession of chemistry. 



Gaston DuBois: The Chemistry and Properties 

 of Glycerophosphates. 



A. R. L. DoHME and H. Engelhabdt: Purity of 

 Chemicals and Quality of Vegetable Drugs during 

 19 IS. 



H. Engelhakdt and O. E. Winters: Spirit of 

 Nitrous Ether. 



'Geo. 0. Beal and Edw. A. Glenz: The Composi- 

 tion of the Fruit of the Virginia Creeper, 

 Ampelopsis quinquifolia. 



'DIVISION op industrial CHEMISTS AND CHEMICAL 

 ENGINEERS 



6. D. Rosengarten, Chairman 



Geo. P. Adamson, Vice-chairman Presiding 



S. H. Salisbury, Jr., Secretary 



Norman A. Dubois: The Protection of Iron and 



Steel hy Paint Films. 



The theories of corrosion of iron and steel are 

 noted and briefly considered from the standpoint 

 ■of the paint technologist. 



Experiments are described to illustrate the 

 •greater protecting qualities of paint films ren- 

 dered less permeable to the corrosion accelerating 

 gases of the atmosphere. Photographs are shown 

 of exposure tests illustrating the relative increased 

 protection of films containing diffusion retarders. 



Percy H. Walker and S. S. Voorhees: Some 



Tests of Paints for Steel Subjected to Alternate 



Exposure to Air and Fresh Water. 



Fifteen paints were included in this series of 

 tests. The tests being designed to compare pig- 

 ments, the same oil and drier were used through- 

 out. The paints were made up to a definite vis- 

 cosity and applied to cleaned steel at definite 

 spreading rates. After thorough drying the plates 

 were placed in tanks which were filled with water 

 each afternoon and emptied each morning. Tests 

 were all in triplicate and all represented one, two 

 and three coat work. Details of method of prep- 

 aration of paints and plates, of painting, exposing 

 and of inspection are given. 

 Chables H. Herty and C. W. Wilmaed: The 



Effect of Besene on Soap Solutions. 

 Charles H. Herty and J. O. Graham: Isoprene 



from Commercial Turpentine. 

 Harry McCormack: The Milling of Wheat and 



Testing of Flour. 

 Harry McCormack: A New Design of CoTce Oven 



and a New Method of CoTcing. 

 H. C. Allen: The Electrolytic Seduction of Iron 



for Permanganate Titration. 

 J. C. Hostetter: A Method for the Determination 



of Magnesium in Calcium Salts. 



The essential part of this method is the concen- 

 trating of the Mg into a precipitate which contains 

 but a small amount of Ca; after this, the ordinary 

 methods of separation may be employed. This 

 concentrating is effected by precipitating the Mg 

 as Mg(OH)2 with excess of solid CaCOH)-. The 

 neutral chloride solution of the Ca salt (10 g. to 

 100 per cent.) is treated with the CaO made by 

 igniting 0.5 gram CaCOj; the solution is heated to 

 boiling and then filtered. The precipitate is dis- 

 solved in HCl; the Ca, etc., removed by a double 

 precipitation with NHjOH and (NH4),C20i; and 

 the Mg determined in the filtrate by precipitating 

 as ammonium magnesium phosphate. Determina- 

 tions of Mg in some 30 highest grade Ca salts are 

 given. 

 E. S. Merriam: Methods for the ExamAnation of 



Natural Gas for the Production of Gasoline. 



The natural gas used for the production of 

 gasoline is a mixture of the first 5 or 6 hydro- 

 carbons of the parafEine series. The exact analysis 

 of such a mixture seems possible only by fractional 

 distillation at very low temperatures. 



By determining the solubility of the gas in 

 kerosene empirical relations between solubility and 

 actual yield can be established. 



By use of a weighed absorption vessel filled with 



