Experiment 75. Home-made weather in- 

 struments. 



89. History of lighting. 



90. Systems of illumination. (See Section 16.) 



91. History of heating. 



92. Modern systems of heating. (See Section 24.) 



a. The hot-air system. 



b. The hot-water system. 



93. Temperature regulators. 



94. The steam engine. (See Section 29.) 



95. Davy's safety lamp. (See Section 30.) 



Experiment 76. Davy's safety lamp. 



96. Clothing. (See Sections 33, 62, 66 and 69.) 



Experiment 77. The testing of cloth. 



97. The use of compressed air. (See Section 44.) 



98. The uses of carbon dioxide. (See Section 39.) 



a. Baking soda. 



b. The chemical engine. 



Experiment 78. The chemical engine. 



c. Mortar. 



99. Cement and plaster of paris. 



Experiment 79. Work with plaster of 

 paris. 



100. First aid to the injured. 



Experiment 80. Exercises in "first aid." 



101. Applications of buoyancy. (See Section 55.) 



a. Hydrometers and lactometers. 



Experiment 81. A home-made hydro- 

 meter. 



b. The diving bell. 



Experiment 82. The diving bell. 

 (More applications of science are given in the 

 work for the seventh grade.) 



