i 9 os] TRANSEAUBOGS OF THE HURON RIVER VALLEY 359 



July, and August of the Huron basin is 8.6 F. (4.8 C.) higher, its 

 rainfall during the same period is less by 2.6 inches (66 mm ). There 

 can be little doubt as to the effect of such differences upon the growth 

 of the bog species, especially the sphagnum whose moisture supply 

 is more directly dependent upon atmospheric water than upon the 



JO.TI Jet> filar fy>r Tflau June July Jjuo 5ef>t Oct flotr 



FIG. 3. Curves of rainfall and temperature conditions in the Huron basin 

 compared with those of the maritime region of Canada. 



soil solution. Again, the occurrence of high temperature with 

 decreased precipitation means the production of conditions impos- 

 sible for the development of the " raised bog," if not unfavorable to 

 the highest development of the "flat bog." 



Since bogs attain their maximum development in a region of 

 great rainfall and comparatively low temperatures, it is reasonable 

 to infer that the extremes of summer heat become peculiarly signifi- 

 cant in this region. Examination of the weather records shows that 



