BRIEFER ARTICLES 
A SIMPLE VAPORIMETER 
(WITH ONE FIGURE) 
The accompanying figure shows a simple form of vaporimeter which 
__ two years’ use has shown to possess some advantages over previously 
. described forms. A is a 2 50° bottle closed with a rubber stopper (C), 
through which pass tightly a 25°" hollow porous tube (B) and a capillary 
tube (D). The capillary tube permits equalization of pressure without 
allowing an appreciable evaporation from the bottle except through the 
Porous tube. The use of uniform capillary tubes insures the same sized 
Opening in all of the bottles of a series, prevents the entrance of rainwater, 
459] [Botanical Gazette, vol. 49 
