330 BF. Craig on the Temperature of the Human Body. 
Ss, 
» The movement of the GLACIAL era carried the northern 
lands upward, at least 5,000 feet above their present level in 
northern Canada, and probably as much or more over the 
higher latitudes to the west and north. 
en followed aslowly progressing subsidence—the great char- 
acteristic of the CHAMPLAIN era—which ultimately sank 
same lands even to a greater extent than they had been raised, 
placing the valley of the St. Lawrence, about Montreal, over 500 
feet below its present level, and probably 1,000 feet at least below 
its level in the Glacial era. ith the commencement of this 
movement, or as it progressed, began the melting of the glacier; 
but the era continued, as proved by elevated beaches full of 
D: 
vast depositions of drift, rivers, like Niagara, sometimes had 
while other water-courses of the Glacial era were wholly cut off, 
as that from the Champlain Lake down the Hudson valley : 
fterward the return movement, that of the TERRACE em 
followed, placing the land finally at its present level, leadin 
thus to a deepening of river channels, and thereby to the mak- 
ing of the river and lake terraces that cover the continent. 
The fact of these grander movements which mark the three 
eras does not preclude the possibility of minor local oscillations 
of level during their progress. 
— 
Art. XLI— Variations in the Tem Hh vA vs 
n perature of the Huma Body 
ie ‘ Craig, M.D. (Read before the Phil Soc. of Wash 
n 
oa 
