20 THE FARMER AND THE WEATHER 



a Low, and blue to color those around a High. Use another 

 color for the isothermal line of freezing, and still another for the 

 isothermal line of zero. 



3. Keep a set of notes on the seasonal changes in plant and 

 animal life, such as the dates of bird migrations, blooming of 

 early wild flowers, blooming of fruit trees, leafing of forest 

 trees, and the planting and harvesting of crops. 



REFERENCES 



Write to the director of the Weather Bureau section in which 

 you live for publications on the climate of your section. Write 

 also to the Agricultural Experiment Station in your state for 

 bulletins on the climate of the state. 



Farmers' Bulletins: 104, Notes on frost; 401, Protection of 

 orchards in Pacific Northwest from spring frosts by means of 

 fires and smudges. 



