590 



STATE BOARD OF AGRICULTURE. 



Fig. 7. Dormant Apple-tree confined in a gas-tight glass cylinder containing air. Aspirating 

 bottles contained mercury. "A" = gas. container; form used in respiration work \vith insects, "th" 

 = the "thimble device." 



TABLE XII. 



Reipiration of a dormant apple tree. 



(Bark surface used ^58 sq. cm. Air 240 c.c.) 



