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The Ohio Journal of Science [Vol. XVI, No. 3, 



Standardized porous cups mounted as shown over ordinary 

 100 CO. graduates, with curved tubes for equaHzing the air 

 pressure, were used. When set at ground or water-level, this 

 gave a means of measuring the drying power of the air at 

 11-14 inches (2.7-3.5 decimetres) up. 



At each station (see map, Fig. 3) an instrument was set 

 at this lowest possible level. At the Scirpus station an anchored 

 raft was utilized, to which the evaporimeter was stoutly lashed, 

 while at the other stations the instruments were fastened 

 to firmly set cypress stakes. In the Calamagrostis, Phragmites, 

 and Typha zones the stakes were of sufficient height to allow 

 the location of a second instrument approximately four feet. 

 (1.5 metres) above the first. 



Composite Profile Showing Evaporation Percentages. 



All readings were taken by myself to eliminate error due 

 to personal equation, and were taken from the bottom of the 

 meniscus. So often as necessary the graduates were carefully 

 refilled to the 100 cc. mark. 



That the profile. Fig. 5, is a composite is readily seen from 

 the zone map, but it has been chosen as affording the most 

 graphic means at hand of setting forth at the same time the 

 majority of relative habitat conditions and the evaporation 

 percentages obtained. The profile will be better understood 

 if it is borne in mind that the left-hand side represents the 

 quarter from which the prevailing winds come, and that during 

 the days for which the corrected totals were figured the actual 

 wind movement from that quarter was 202 miles in excess of 

 .that from the opposing quarter,^ which moreover is strongly 

 sheltered by Cedar Point itself. 



