420 



SCIENCE. 



[N. S. Vol. XVII. No. 428. 



PyroMtumeiis : 



Practically insoluble in cliloroforni or 

 heavy petroleum hydrocarbons. 



1. Derived from petroleum. 

 Albertite, with varieties called 



nigrite, etc. 

 Elaterite. 

 Wurtzelite. 



2. Derived from direct metamor- 



phosis of vegetable growth. 

 Anthracite. 

 Bituminous coal. 

 Lignite. 

 Peat? 

 The following papers were also read: 



Some of the Work of the Bio-Chemic Di- 

 vision, Department of Agriculture: B. 



A. DE SCHWEINITZ. 



Does Cholesterol Occur in Corn Oil? A. 



H. Gill. 

 Miley's Color Photography : W. G. Brown. 

 The Composition of Fresh and Canned 



Pineapples: L. S. Munson and L. M. 



TOLMAN. 



Chemical Composition of some Tropical 

 Fruits and Fruit Products: E. M. 

 Chase, L. S. Munson and L. M. Tol- 



MAN. 



Nature of the Work of the Bureau, of 

 Chemistry, Department of Agriculture: 

 H. Y. Wiley. 



Iodine Ahsorption of Oils; Comparison of 

 Methods: L. M. Tolman and L. S. Mun- 

 son. 



The Relation of the Specific Gravity of 

 Urine to the Solids Present: John H. 

 Long. 



Derivatives of Isoapiol and Isosafrol: F. 

 J. Pond. Read by title. 



Report of the Committee on Atomic 

 Weights: F. "W. Clarke. 



Report of the International Committee on 

 Atomic Weights: F. W. Clarke. 



On the Need of Systematic Action regard- 

 ing the Question of Substitution and 

 Adulteration: Leon L. Waiters. Read 

 by title. 



The Chemical Work of the Bureau of Soils, 

 Department of Agriculture: Frank K. 

 Cameron. 



The Action of Metallic Magnesium on 

 Aqueous Solutions: Louis Kahlenbekg. 



Action upon Metals of Solutions of Hydro- 

 chloric Acid in Various Solvents: Har- 

 rison B. Patten. 



A Proposed Method of Examining Wood 

 Treated to Resist Fire: C. F. McKenna. 



An Electric Test Retort: C. F. McKenna. 



The Basic Sulphates of Beryllium: Chas. 

 Lathrop Parsons. 



The Picrates of the Rare Earths: L. M. 

 Dennis and W. C. Geer. 



The Chemical Work of the II. 8. Geological 

 Survey: F. W. Clarke. 



A Method for the Colorimetric Determina- 

 tion of Phosphates and Silicates when 

 Both are Present: Oswald Schreineb. 



A New ( ?) Meteorite from Augusta 

 County, Virginia: H. D. Campbell and 

 Jas. Lewis Howe. 



A Volumetric Method for the Determina- 

 tion of Chromic Acid in Chrome Pig- 

 ments: B. E. EWELL. 



Suggested Improvement in Chlorine De- 

 termination: Chas. Baskerville. 



The Determination of the Hydrocarbons in 

 Illuminating Gas: L. M. Dennis and J. 

 G. 'Neill. 



Reduction with Soluble Anodes: Wilder 

 D. Bancroft. 



Solubility Curves for Magnesium Carbon- 

 ate in Aqueous Solutions of Sodium 

 Chloride, Sodium Sidphate and Sodium 

 Carbonate: Frank K. Cameron and 

 Atherton Seidell. 



