I 56 NATURE STUDY AND AGRICULTURE 
may run together and stick together, forming a hard lump when dry: 
the sandy soil should not show so much injury. 
13. Oral and Written Composition. — Suggested themes based on 
the preceding projects. 
a. Soils, — good, bad, and indifferent. — Illustrated with samples 
from your part of the country. Projects Nos. 1 and 2. 
b. Subsoils and their importance. — No. 3. 
Humus and its value. — Nos. 4, 5, and 6. 
. Effect of corn and potatoes on the soil. — No. 7. 
Effect of the dust blanket. — No. 9. 
Soil and air. — Nos. to and 11. 
PS As 
