WHOLE VOL. 



NORlli AMERICA 



843 



DP]TEO[T. T'NITED STATES 



Lat. 42° 20' N. Long. 83° 3' W. H„ = 730 ft. 



TEMPERATURE IN DEGREES F. 



Means of i(7" + 14" + 21")* 



Obscrvalioiis usually at, 7". II" ami 21", but occasinn.illy at 8". 11" an.l 21". 



