CONTENTS. Vll 



52. Compressibility of air and oxygen between 18 and 22C . . -77 



53. Relation between pressure, temperature and volume of sulphur dioxide 78 



54. " " " " " " " ammonia . 78 



55. Compressibility of liquids ......... 79 



56. " " solids . .80 



57. Specific gravities corresponding to the Baume scale . . . .81 



58. Reduction of weighings in air to vacuo 82 



59. " " densities " " " " 82 



60. Densities of the solid and liquid elements . . -83 



61. " " various woods ......... 85 



62. " " " solids 86 



63. " " " alloys . . 87 



64. " " " natural and artificial minerals . . . .88 



65. " " molten tin and tin-lead eutectic 88 



66. Weight in grams per square meter of sheet metal . . 89 



67. " " various common units of sheet metal . ... 89 



68. Densities of various liquids ......... 90 



69. " " " gases .... ... . 91 



70. " " " aqueous solutions of salts, bases and acids . . 92 



71. Density of water free from air between o and 36 C . . . -94 



72. Volume of water at temperatures between o and 36 C in terms of its 



