37 



Compare angle of sun's rays at New Orleans and Detroit. 

 Compare relative amount of heat and light; effect upon 

 life. 



XOTE. — Relate effect of frost upon rocks to rapid disintegra- 

 tion. Effect of clieinical and physical forces upon calcerous and 

 silicious rock. 



Read Ruskin's "Ethics of the Dust" in connection with the 

 study of crystals. 



MAECH. 



PLANTS. 



Watch first awakening of the tree following outline for 

 "Tree Study." 



ANIMAX.S. 



Note first appearance of insects. Note beauty of color, 

 delicacy of marking. Compare fully developed insect with 

 larva; what likenesses and differences — food, manner of 

 feeding, locomotion. 



Pond life — spawn of frogs and toads; development of 

 tadpoles into frogs. Crayfish; turtles; snails. 



MINERALS. 



Water. Place a drop of salt, hydrant, lime, rain, filtered 

 or distilled water on a clean piece of glass, and evaporate. 

 Explain result. Relate to animal life in water, and beds of 

 lime-stone. 



ELEMENTARY GBOGRAPHT. 



Compare lowest and highest temperature of March with 

 September and December. Compare most northern and 

 southern isotherm of September and March. 



