28 



FORESTRY BULLETIN 



THE ACTIVE SEASON OF GBOWTH. 



The period of active growth of trees in Michigan is the six months from 

 May to October. The cold season both as regards temperature and pre- 

 cipitation of atmospheric moisture has a small influence on forest growth. 



A table is here presented giving the mean rainfall in inches for the six 

 months of each year, and the monthly temperature for the year. 





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