For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C. Price 45 cents Contents Pa 1. 65 2. 39. Potassium bromide, KFr 66 2. 40. Potassium iodide, KI 68 2.41. Calcium fluoride, CaF^(fluorite) 69 2.42. Barium fluoride, BaF^70 2.43. Mercurous chloride, Hg^CJ ^(calomel).. 72 2.44. Mercuric chloride, HgCl ^7 3 2.45. Mercuric iodide, Hgl^74-2. 46. Lead fluochloride, PbFCl (matlockite) 76 2.47. Potassium cyanide, KCN 77 2.48. Sodium cyanide (cubic), NaCN 78 2.49. Sodium cyanide (orthorhombic), NaCN 79 2.50. Strontium nitrate, Sr(NOj) ^80 2.51. Barium nitrate, Ea(NOj) ^(nitrobarite) 81 2.52. Zinc borate, ZnF.O, 83 J 4 2.53. Magnesium silicate, Mg^SiO^( forsterite) 83 2.54. Magnesium tungstate, MgV