238 INTRODUCTION TO GENERAL SCIENCE 



degree. Fog condenses on the foliage and drips to the ground, 

 adding a little to the streams. 



The greatest danger to forests is that of fire. After this 

 come destructive lumbering, trampling and browsing by 

 grazing animals, wind, and fungi. 



References : 



1. 1304:349-350. Forest Growing. 



2. 1407 : 490-492. The Forest Region. 



3. 1503 : 116-117. Forestry and the Value of Trees. 



4. 1605 : 216-226. The Wood Crop. 



5. Farmers' Bulletin No. 173. A Primer of Forestry The 



Forest. 



6. Farmers' Bulletin No. 358. A Primer of Forestry Prac- 



tical Forestry. 



7. Farmers' Bulletin No. 134. Tree Planting on Rural School 



Grounds. 



8. Farmers' Bulletin No. 181. Pruning. 



9. Farmers' Bulletin No. 228. Forest Planting. 



10. Farmers' Bulletin No. 423. Forest Nurseries for Schools. 



11. Forest Service, Circular 130. Forestry in the Public Schools. 



12. Forest Service, Bulletin 36. The Woodsman's Handbook. 



13. Reprint from Yearbook of Department of Agriculture for 



1903. The Relation of Forests to Stream Flow. 



14. Reprint from Yearbook of Department of Agriculture for 



1905. How to Grow Young Trees for Forest Planting. 



a. 1402 : 222-223. Rotation of Forests. 



b. 1502:365-391. Forestry. 



c. 1606:3. Forestry Denned. 



173. LOWER FORMS OF PLANT LIFE BACTERIA, MOLDS, 

 AND MILDEW 



Bacteria, as well as molds and mildew, are minute plants, 

 although they were long considered as having animal life. 

 Their greatest peculiarity is the method by which they are 



