40. Icebergs. 



Experiment 45. Why ice floats, 



41. The composition of water. 



a. Chemical 



Experiment 46. To prepare hydrogen. 



b. Physical. 



Experiment 47, A physical examination 

 of water, 



42. Spring and streams. (See Sections 92 and 93.) 



43. Geysers and hot springs. 



Experiment 48. To illustrate a geyser. 



44. Artesian wells. (See Section 94.) 



Experiment 49. To illustrate an artesian 



well. 



(This subject, Water, is continued in the work 

 for the eighth grade.) 



PLANTS AND ANIMALS. VII. 



45. A brief summary of the facts stated under the 

 same topic in the work for the fifth and sixth grades. 



46. Forestry. 



a. What is meant by forestry. 



b. Practical forestry. (See Section 96.) 



Experiment 50. The collection and plant- 

 ing of seeds of forest trees, 



47. Forest conservation. 



a. Its advantages. 



Experiment 51. The effect of forests 

 upon the run-off of water, 



b. How accomplished, 



c. The enemies of the forest. 



48. The propagation of plants. 



a. Arency roots, cuttings, leaves, buds, grafts, 

 and seeds. 



