Cannon : A method of measuring transpiration 



521 



packed on the back of a horse, for some miles into the mountains 

 when it was necessary to make the load the h'ghest possible. In 



Figure 5. The manner of using the polymeter method in studying the transpira- 

 tion of ajmistletoe, Phoradendron californicum. 



suchVcase oiled cloth of some sort was substituted with success 

 for the heavier and more cumbersome forms of base. A cloth 



