REFERENCES 189 



thimbleful of seed and ask him to separate the seed and the dirt into 

 piles. In a rough way the per cent of dirt may thus be estimated. 



5. Determine the needs of a growing plant, air, moisture, heat, 

 and light, by simple experiments such as those suggested in the 

 text. 



6. In a large glass jar containing soil, plant different seeds at differ- 

 ent depths. Place the seeds against the glass in order that their 

 attempts to rise to the surface may be noted. This experiment is very 

 simple and instructive. 



7. Ascertain, if possible, how the farmers of the neighborhood 

 start their plants, and where they obtain their seed. 



REFERENCES 



Botanies. 



Nursery Book. Bailey. 



Pruning Book, Bailey. 



Systematic Pomology. Waugh. 



Farmers' Bulletins. Washington, D. C. 



113. The Apple and How to Grow It. 



134. Tree Planting on Rural School Grounds. 



154. The Home Fruit Garden : Preparation and Care. 



157. The Propagation of Plants. 



181. Pruning. 



213. Raspberries. 



428. Testing Farm Seeds in the Home and in the Rural School. 



