traftox] OUTLINE OF NATURE-STUDY 117 



II. School Hygiene. 



Ventilation and heating; lighting; drinking fountains; playgrounds; 

 medical inspection. 



Spring 

 I. Forestry. 



Uses of forests, decrease; enemies; forest control ; reservations; con 

 servation; Bureau of Forestry; Minnesota state forest service, 

 tree planting on prairies; uses and structure of woods; work of the 

 parts of a tree. 



II. Bird Friends of the Forests. 



Special study of birds of the woods; economic value of birds; adapta- 

 tions in the structure of birds; enemies; work of national govern- 

 ment to protect birds. 



