72 



CLIMATIC CYCLES AND TREE GROWTH 



1 Table prepared by Mr. Schulman. 



2 See page 146 for meaning of underlines. 



Thus we find consistent cycles as follows: 6.8 months, weak; 8 months, 

 very strong; 11± months, strong; 13.5 to 14 months, strong; 16 to 174- 

 months, strong; 25 medium 27 months, strong. 



ABBOT'S RADIATION MEASURES 

 The heat reaching us from the sun can be measured by the rate at which 

 it raises the temperature of water or silver or other substances suitably black- 



