310 



SCIENCE 



[N. S. Vol. XXIX. No. 738 



The Indirect Oolorimetrio Estimation of Small 

 Amounts of PjOs with Uranium Acetate and 

 Potassium, Ferrooyanide : R. B. Gibson. 



Factors which Influence the Determination of 

 Kreatinin: F. C. Cook. 



On the Oxidation of Carbon Monoxide: J. H. 

 Kastus. 



The Relations of Magnesium and Phosphorus to 

 Growth m the Fungi: Howaed S. Reed. 



Is Platinum Black Capable of Effecting the Hy- 

 drolysis of Ethyl Butyratet A. S. Loevenhabt. 



The Absorption and Partial Purification of Gat- 

 alase from Liver: A. W. Petebs and H. W. 

 Stewabt. 



The Diastatic Enzyme of Ripening Meat: A. W. 

 Petebs and H. A. Mattiix. 



The Influence of the Isomers of Salicylio Acid on 

 Metabolism: E. W. Rockwood. 



Surface Tension as a Factor in the Distribution 

 of Salts in Animal and Vegetable Cells: A. B. 

 Macallum. 



Esterification of the Bile Acids: Ibaao King 

 Phelps. 



Estimation of Total Sulphur: Isaac King Pheus. 



.4. Study of Ny lander's Reaction: M. E. Rehfuss 

 and P. B. Hawk. 



The Determination of Iodine in Protein Combina- 

 tions: L. W. RiGQS (by invitation). 



A Distributing Factor in Barfaed's Test : W tt.t.t aw 

 H. Welkee. 



DIVISION of INDUSTBIAL CHEMISTS AND CHEMICAL 



engineebs 

 A. D. Little, chairman 

 The Munroe Crucible: Walteb 0. Snelling. 



The use of platinum felt as the filtering medium 

 in a crucible of the Gooch pattern was first sug- 

 gested by Professor Charles E. Munroe, in an 

 article entitled " Filtration with Filters of Metal- 

 lic Felt " published in the Journal of Analytical 

 Chemistry, Vol. 2, part 3, July, 1888. 



Crucibles prepared by the method suggested by 

 Professor Munroe have many advantages not pos- 

 sessed by any other type of apparatus used for 

 filtration. These filters retain the finest pre- 

 cipitates, and owing to the fact that no other 

 material than platinum enters into the construc- 

 tion of the filter, no impurity other than this 

 metal can contaminate the filtrate, and thus in 

 very exact work a very great advantage is gained 

 through the use of the Munroe crucible. 



A series of tests were described, showing that 

 the porosity of the mat of the Munroe crucible 



was many times greater than that of the asbestos 

 mat in crucibles of the usual type. The prepara- 

 tion of the crucible was described, and a number 

 of experiments were mentioned showing the wide 

 range of applications for which the crucible was 

 suited, and the many classes of work in which it 

 has been found to be superior to other types of 

 filtering apparatus. 



The Rapid Determination of Moisture in Com- 

 mercial Products of a Yiscous or Semi-solid 

 Consistency: Abthub Lowenstein. 

 The author states that "the method employed 

 consists merely in the application of several well- 

 known principles, viz., the addition of a dehy- 

 drating agent of a lower boiling point than water, 

 in which the material to be desiccated is wholly 

 or in part soluble, or at least miscible. The re- 

 agent employed is ordinary 95 per cent, ethyl 

 alcohol. In the case of materials containing sol- 

 uble proteins, the alcohol acts in some eases aa a 

 coagulant, and in others as a precipitant, which 

 action facilitates the drying process. A definite 

 quantity of the material is weighed into a metal 

 dish, 2} inches in diameter, together with a short 

 glass stirring rod, 15 c.c. of alcohol added; stirred 

 thoroughly; evaporated on steam bath; another 

 portion of alcohol added and similarly evaporated. 

 Dish then transferred to jacketed oven at 105° C. 

 and dried to constant weight. Total period of 

 drying, li-2J hours. Table gives results of tests 

 on meat extracts, concentrated glue solutions, 

 concentrated tank water, inspissated ox gall, dye- 

 wood extracts, syrups, various kinds of cheese, etc. 



An Unusual Incrustation on Generator Coils: E. 



H. Ehbenfeld. 



On the generator coils of a refrigeration plant 

 of the absorption type there was formed a hard, 

 semi-crystalline scale about one sixteenth of an 

 inch thick. Its texture was very compact, its 

 density 5.117, and on being tapped it gave almost 

 a metallic sound. 



It was formed on the outside of two-inch iron 

 pipes through which steam circulated. The pipes 

 were surrounded by strong aqua ammonia, and it 

 was from this ammonia that the scale was de- 

 posited. A part of the circulation system having 

 been constructed of galvanized iron, zinc was 

 taken up by the ammonia and the scale deposited 

 therefrom contained over 90 per cent, of zinc 

 oxide. 



Abstracts have not been received for the fol- 

 lowing papers: 

 Rapid Analysis of Babbitt Metal: Pebcy H. 



Walkee and H. A. Whitman. 



