c. Repulsion. 



Experiment 76. The rule of attraction 



and repulsion. 



(These subjects, Magnetism and Electricity, 

 are continued in the work for the sixth grade.) 



THE ARTS AND INDUSTRIES. V. 



69. Weather observation. 



A simple record of the weather should be kept. 



70. How to make blue print paper. (See Sections 



12, 62, and 68.) 



71. Solar heaters. (See Section 17.) 



72. Hot air engines. (See Section 18.) 



Experiment 77. The way a hot air en- 

 gine works. 



73. Fireproofing. (See Section 23.) 



Experiment 78. Simple fireproofing. 



74. Waterproofing. (See Section 35.) 



75. Flavoring extracts and perfumes. (See Section 



36.) 



76. To remove grease and stains. (See Section 36.) 



77. How to make soap. (See Section 39.) 



Experiment 78. How to make soap. 



78. Bread making. (See Section 49.) 



79. The pantagraph. (See Section 65.) 



Experiment 79. How to make and use 

 a pantagraph. 



80. Alcohol for industrial purposes (See Section 49.) 



(More applications of science are given in the 

 work for the sixth grade.) 



