244 



SCIENCE 



[N. S. Vol. XXVI. No. 660 



specific gi-avity, similar in behavior to 

 those described as cadmium iodide by 

 Clarke and Kebler {Am. Chem. J. 5, 235, 

 1883), but these on analysis proved to con- 

 tain some hydriodic acid and water. It 

 is concluded that there is no satisfactory 

 evidence of the existence of a form of 

 cadmitim iodide of lower specific gravity 

 than 5.6. 



Platinum Besistance Furnace for Melting 

 Points and Comlustions: S. A. Tuckeb. 

 A description of a new electric furnace 

 consisting of a quartz tube, heated by a 

 spiral of platinum tape, the whole being 

 surrounded by infusorial earth enclosed in 

 an asbestos bos. Most excellent results on 

 combustions and on the determination of 

 melting points were obtained in this ap- 

 paratus. 



Determination of Carbon Dioxide: W. H. 

 Waggaman, Bureau of Soils, Washing- 

 ton. 



The apparatus differs from that previ- 

 ously described by Cameron and Breazeale, 

 by having an Ostwald regulator to control 

 the flame under the decomposition flask, 

 and by having a coil of tubing to cool the 

 upper portion of the flask. Fairly accurate 

 results for COj from several organic com- 

 pounds and carbonate minerals have been 

 obtained in forty minutes. 



Some New Compounds of Indium: F. C. 



Mathees and C. C. Schleuderbeeg, 



Cornell University. 



This paper outlines the methods of 

 preparation and properties of some new 

 compounds of indium. 



Indium perchlorate was prepared by 

 dissolving metallic indium in perchloric 

 acid. The solution was allowed to crystal- 

 lyze.in a vacuum desiccator. 



Indium iodate was prepared by precipi- 



tating a solution of indium chloride with 

 potassium iodate. It is a white crystalline 

 substance, soluble in 1,500 parts of water 

 and 150 parts of 1 :5 nitric acid. It is 

 decomposed by hydrochloric acid. 



Indium selenate was formed by dissolv- 

 ing indium hydroxide in selenic acid 

 which had been prepared by the electrolysis 

 of copper selenate. 



Indium ccesium selenate (alum) was pre- 

 pared by crystallizing a solution of indium 

 selenate and ccesium selenate. 



The Separation of Iron from Indium: F. 



C. Mathees, Cornell University. 



Nitraso y8-naphthol quantitatively pre- 

 cipitates iron from an acetic acid solution 

 while indium remains in solution. Color- 

 imetric analysis of the indium solution 

 after the removal of the iron showed that 

 the content of the iron varied from mere 

 traces to .025 per cent. 



A System of Qualitative Analysis for the 

 Common Elements: The Aluminum and 

 Iron Groups: A. A. Notes, W. C. Beat 

 and E. B. Speae. Presented by E. B. 

 Speae. 



This is a continuation of the work 

 already published in the Journal of the 

 American Chemical Society and wiU ap- 

 pear later. 



Distribution of Mineral Nutrients in Soil 

 Separates: G. H. Feailtee, J. G. Smith 

 and H. R. Wade. Reported by title. 



Potassium Ammonozincate: Edwaed C. 



Feanklin, Stanford University. 



The compound Zn(NHK)22NH3 has 

 been prepared and studied. The analogy 

 between the ammonia and water systems of 

 bases, acids and salts is shown to extend to 

 the formation of the ammonia analogue of 

 potassium zincate. This is a continuation 

 of previous work along similar lines. 



