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. 
1898 | A NEW TRANSPIRATION MACHINE 345 
mistake in measuring the water absorbed, and Krutizky’s appa- 
ratus is inapplicable for the same reason. 
The apparatus now to be described was made for the Indiana 
University, from my plan, through the Cambridge Botanical 
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A SELF-REGISTERING TRANSPIRATION MACHINE. 
Supply Company, by Professor J. C. Arthur. The cost is about 
$35. The frame, made of iron tubing, stands twenty-five inches 
high, and is fifteen inches wide. Each arm bears at the end 
a piece of plate glass, which must lie with its upper face 
exactly horizontal. Two wheels of aluminum, cut out so as to 
