﻿BOTANICAL GAZETTE 



2. Comparison of sphagnum with bare peat. — The mean minimum 

 temperatures of the air at station 7 (bare surface of peat in the 

 center of a scalped area 10 feet square in an uncultivated portion 

 of the bog) and at station ja (over sphagnum moss at a distance 

 of 5 or 6 feet from station 7) for September 1906, at Mather, Wis- 

 consin, were as follows (table 4, p. 46) : 



B. SOIL TEMPERATURES 



The mean minimum temperatures of the soil for May, June, 

 July, August, September, and October 1907, at Mather, Wisconsin, 

 were as follows: 



1. Comparison of bog with hard land (table 19, p. 82). — 



Cox (p. 119) says "frost remains in the soil of an unflooded 

 bog until comparatively late in the season, and there have 

 been found instances of frost in the soil in marshes as late as 

 July 4." 



2. Comparison of sphagnum moss with bare peat (table 4, p. 45) 

 for September 1906, at Mather, Wisconsin.— 



