444 



SCIENCE 



[N. S. Vol. L. No. 1297 



Pentathionate, with sulphite, aecompanies As^Ss 

 along the horizontal lines. 



4H. + 28,0/' + SaOo" = S,0/' + 2SO2 + 2H^0. 



Specific heat determinations with an adiabatio 



calorimeter: Tarrington Daniels and Charles 



B. HURD. 



The partition of metallic radicals between a salt 

 phase and an alloy phase: Herbert F. Sill. 



The retention of bromine by silicic acid gel: W. 

 A. Patrick and E. L. Eyerson. 



Determination of the viscosity of pyroxylin so- 

 lutions: E. F. HiGGiNS and E. C. Pitman. 



A slide rule for special cases : F. C. Blake. 



Adsorption by precipitates. {II-), the adsorp- 

 tion of anions by hydrous ferric oxide: Harry B. 

 Weiser and Edmund B. Middleton. 



The physical character of hydrous ferric oxide: 

 Harry B. Weiser. 



Flame reactions of selenium and tellurium: 

 Harry B. Weiser and Allen Garrison. 



Tlie catalyst in the oxidation of ammonioi: G. A. 

 Perley. 



Equilibria in the systems: carbon disulfide, 

 methyl alcohol and carbon disulfide, ethyl alcohol: 

 E. C. McKelvy and D. H. Simpson. The mutual 

 solubility relations of the two pairs of liquids were 

 determined over practically the whole range of 

 concentrations paying particular attention to the 

 purity of the materials used. The following values 

 were obtained for the critical solution tempera- 

 ture and the critical concentration: for methyl al- 

 cohol — carbon disulfide + 35.7°, 84.7 per cent. OS,; 

 for ethyl alcohol — carbon disulfide —24.4°, 82.7 

 per cent. OS,; applications to the determination of 

 small quantities of water in the alcohols and the 

 analysis of anhydrous methyl and ethyl alcohol 

 mixtures were pointed out. 



Notes on the estimation of nitrates atnd nitrites 

 in battery acids: Lily Bell Sefton. 



A metal to glass joint and some of its applica- 

 tions : E. C. McKelvy and C. S. Taylor. 



Fluorides of cobalt, niclcel, manganese and 

 copper: F. H. Edmister and H. C. Cooper. The 

 fluorides of cobalt, nickel, manganese and copper 

 can be prepared by dissolving the hydroxide or 

 the carbonate of the metal in hydrofluoric acid, the 

 same product being obtained, whichever is used. 

 In all cases a crust-like product was obtained. 

 By recrystallizing from water, slightly acidulated 

 with hydrofluoric acid, crystals of the acid fluo- 

 rides were formed and analyses and measurements 

 of these crystals were made. The analyses indi- 



cated that these salts all form an isomorphous 

 series but the crystallographie measurements 

 showed that only the cobalt, nickel and manganese 

 salts are isomorphous, while the copper salt be- 

 longs to a different system. The formulas of all 

 four fluorides are of the same acid fluoride type: 

 MF2.5HF.6HgO. It was surprising to obtain the 

 acid fluoride by recrystallization from water, a 

 basic salt being expected under these conditions. 

 These acid fluorides are not permanent in the air 

 but decompose, losing hydrogen fluoride and, in the 

 case of copper, losing water also, so that the cry- 

 stals used for analyses must be carefully selected. 

 The formation of a hydrated, non-crystallized crust 

 is distinct from that of the hydrated acid fluoride 

 crystals. In this crust the ratio of metal to fluo- 

 rine, for the cases of cobalt and nickel, was found 

 to be about one to two, with varying water con- 

 tent. This crust differs from the crystals in solu- 

 bility and form, as well as in composition. We 

 have arrived at the conclusion that the crust de- 

 scribed by Berzelius as containing two molecules 

 of water, the crust later described by Clarke as 

 containing three molecules of water, and the crust 

 and powder obtained by us are the same, the 

 water content being variable and the crystal form 

 being undeveloped. All were obtained in the same 

 manner. 



The determination of mercury: H. B. Gordon. 

 The preparation and uses of TiCl, solution: F. 

 L. English and H. S. Tanner. 



Contrasting effects of sulfates and chlorides on 

 the hydroge7i ion concentration in acid solutions: 

 A. W. Thomas and M. E. Baldwin. 



Chromophor tautomerism in indicators : William 

 C. Arsem. 



Charles L. Parsons, 



Secretary 

 {To be continued) 



SCIENCE 



A Weekly Journal devoted to the Advemcement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON. N. Y. 



NEW YORK, N. Y. 



Enteied in th« potl-officc at Lancutcr, Pa., at lecond dasi mattel 



