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BOTANICAL GAZETTE 



[FEBRUARY 



months of May, June, July, August, September, and October 

 1907, at Mather, Wisconsin, are given in tables 15 and 15a, p. 74. 



Anemometer on warehouse (upland) 32 ft. 7 in. above ground. 

 Anemometer on marsh 4 ft. 7 in. above ground (station 4). Ane- 

 mometer on warehouse 50 ft. 5 in. above surface of marsh at 

 station 4. Difference between elevation of anemometers, 45 ft. 

 10 in. 



The following are the data for Mather, Wisconsin, May 13— 

 October 31, 1907 (table 21, pp. 98-112). At 7 p.m. the mean 

 relative humidity for the month was higher on the bog than on 

 the upland for every month, the mean excess of the bog over the 

 upland being 9.5 per cent. At 7. a.m. the mean was greater on 

 the bog than on the upland for every month except June, when the 

 two were equal. Considered by days the relative humidity of the 

 bog at 7 a.m. was greater than that of the upland on 67 .9 per cent 

 of the days of the whole season, and equal to it on 8 . 7 per cent of 

 the days. At 7 p.m. it was greater on the bog on 88 . 9 per cent of 

 the days and equal on 4 . 7 per cent. 



1. The temperature conditions in both soil and air are less 

 favorable for plants in the bog than on the neighboring hard 



2. Temperature conditions are less favorable for plants in 

 sphagnum moss than in bare peat. 



3. In so far as a difference of temperature between air and soil 

 is unfavorable for plants, the conditions in a sphagnum bog are 

 much less favorable than in the neighboring hard land. 



4. The conditions, so far as relative humidity is concerned, were 

 less favorable for transpiration on the bog than on the neighboring 

 hard land. 



Upland. 



E. RELATIVE HUMIDITY 



CONCLUSIONS 



