CHAPTER XI. INSTRUMENTS FOR ASCERTAINING THE HUMIDITY OF THE AIR.

97. Hygrometric Substances.

98. SAUSSURE'S HYGROMETER.

99. Dew-Point.

100. DROSOMETER.

101. Humidity.

102. LESLIE'S HYGROMETER.

103. DANIEL'S HYGROMETER.

104. REGNAULT'S CONDENSER HYGROMETER.

105. Temperature of Evaporation.

106. MASON'S HYGROMETER.

107. SELF-REGISTERING HYGROMETER.

108. Causes of Dew.

109. Plan of Exposing Thermometers.