MIPr'ERALOGICAL OHEMISTRY. Mineralogical Chemistry. ii. 71 Mineralogy of the H.B. Mine Salmo British Columbia. 7'. L. WALKER (Toronto Cniu. Studies G'eol. Ser. No. 10 1918 reprint 25 pp.).-The oxidised zinc-lead ores of this *ne consist of' a mixtnre of hemirnorphite cerussite and limonite and occur as bedded I ' veins " in metamorphosed limestone with associated quartzite and schists and penetrated by dykes of minette. A cave iu the mine contains also a iiuinber of zinc phosphate minerals I'orming large stalactitic pillars which yielded about a hundred toris of ore. These stalactites consist mainly of a core of spencerite with a thin crust of hemimorphite and between the two solutioii cavities containing crystals of hemimorphite (anal. I deducting G-667L calcite) spencerite hopeite parahopeite (anal.11 D 3*236) and hibbenite. Crystallo'graphic descriptions are given of each of Lhese minerals except the hibbenite the existence of which is not confirmed. On the floor of the cave and partly coating the stalactites is a deposit of a grey or cream-coloured non-plastic zincif erous clay (anal. III) resembling the so-called moresnetite and vanuxemite in composition but doubtless a mixture of some zinc mineral with clay. The phosphoric acid of these minerals was perhaps derived from the solution of apatite in .the surrounding rocks. ZnO. MgO. A120,. Fe,08. SiO,. P,Os. H20. Total. I. ...... 67.35 - - - 25.32 - 7-33 100~00 11. ...... 54.69 - - - - 30.46 15-31 100.46 111. ...... 19-99 3.97 16.07 8.01 39.49 0.26 11.12 98.91 The zinc phosphate minerals now known are the following; they 3"ii.72 ABSTRACTS OF CHEMICAL PAPERS. are all reniarkable for their chemical puriby) there being a com- plete absence OF elements n o t shown in the formulz (A. 1908 ii 397). Hopeite.. . . . . . . . . . . Zn,(P0,),,4H20 orthorhombic Parahopeite . . . . . . Zn,(P0,),,4H20 triclinie Tarbuttito Spencerite Hibbenite ......... 2Zn,(l’0,),,Zn(OH),,6$H2O orthorhombic (A 1916 ii 669). 1 . . . . . . Zns(PO4)Jh(OH) triclinic .. . . . . Zns(Y0,),,Zn(OH),,3H207 monoelinic (A 1916 ii 629). L. J. S. Examination of the Hot Springs at Banff Alberta. R. T. ELWORTHY (Trans. Roy. SOC. Cmmda 1917-1918 [iii] 11 27-33).-An analysis of the water of and the gases evolved from the six hot springs a t Banff Alberta has been carried out.The upper hot spring contaiiis the following amounts of dimolved solids in parts per million of water 634 SO,; 10 (3; 133 HCO,; 239 Ca; 39.7 Mg; 9.1 alkalis; 31 SiO,. The total solids amount to 1100 parts per million. Among other metals present are iron aluminium manganese strontium magnesium lithium pot assiurn and sodium. The gases evolved by the springs contained methane hydrogen oxygen carbon dioxide nitrogen helium aiid argon. Full analyses are recorded in the paper. These springs are the most radioactive of any yet examined in Canada the emana- tion content of the gas being (1910-2370) x 1 0 - 1 2 curies per litre whilst that of the water is (221-640) x 10-l2 curies per fitre. The dissolved radium is (8-5-23.5) x grams per litre. J. F. S. The Thermal Mineral Springs of Rio Hondo. HPRCULES CORTI ( A nd. SOC. Qicim. Aryentinct 1918 6 215-229).-A detailed accoiint of the medicinal properties and chemical com- position of the thermal springs of Rio Hontlo in the province of w. s. M. Santiago tlel Ester0 in the Argentine.