ELIMINATION 



179 



a record paper attached to a revolving drum. In use the plant to te studied 

 is prepared in the manner usual for transpiration studies, and is balanced 



FIG. 45. PRECISION TRANSPIROGRAPH; Xf. 



Description in text. 



on a scale-pan of any good balance sensitive to one gram, while the tran- 

 spirograph is adjusted Leside it. As the plant loses water this pan rises, 



