1905] TRANSEAU—BOGS 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™™). 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 
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hie 3—Curves of rainfall and temperature conditions in the Huron basin 
Pared with those of the maritime region of Canada. 
Soil solution, Again, the occurrence of high temperature with 
“cteased precipitation means the production of conditions impos- 
nthe 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 
a rainfall and comparatively low temperatures, it is _ 
Cal y os the extremes of summer heat become peculiarly sigmh- 
"tin this region. Examination of the weathér records shows that 
