xiv CONTENTS. 



CHEMISTRY. 



TABLE I)A(;I: 



80. Atomic and Molecular "Weights, Densities, and Solu- 



bilities of the chief Elements and Compounds . . 56 



81. Atomic Weights of Rare Metals 02 



82. Factors for Gravimetric Analysis 63 



83. Factors for Volumetric Analysis 64 



84. Scales of Hardness of Water 65 



85. Multiples of some Atomic and Molecular Weights . . 65 



86. Comparison of Hydrometer Scales 66 



87. Density and Composition of Acids 67 



88. Density and Composition of Solutions of the Alkalies, 



Sodium Chloride, and Alcohol 68 



89. Estimation of Carbon Dioxide in Air 69 



90. On the Heat evolved in Chemical and Physical Actions 70 



91. Heat evolved in Allotropic Changes of the Elements . 70 



92. Heat evolved in the Solution of Gases 70 



93. Heat evolved in the Formation of Solid Salts from 



Solid Basic and Gaseous Ai-id Oxides 71 



94. Heat evolved in the Formation of Gaseous Compounds 



from Gaseous Constituents 71 



95. Heat evolved in the Formation of Oxides 72 



96. Heat evolved in the Formation of Chlorides .... 7? 



97. Heat evolved in the Formation of Sulphides .... 73 



98. Heat evolved in the Formation of Hydrates 74 



99. Heat evolved in the Formation of Non-Metallic Com- 



pounds 75 



100. Heat evolved in Combustion 77 



101. Miscellaneous Data 78 



PHYSIOGRAPHY. 



102. Geological Formations 79 



103. Lengths of Rivers in Kilometres 82 



104. Heights and Depths in Metres 83 



105. Velocity and Pressure of the Wind 83 



