Written by Swiss-born geologist and explorer Louis Agassiz (1807-73), this 1850 publication was the first detailed scientific account of the natural phenomena of Lake Superior. Agassiz, who became a professor at Harvard and later founded the Harvard Museum of Comparative Zoology, was the first scientist to suggest that the earth had experienced an ice age. In the summer of 1848 he led an expedition of his students to Lake Superior, to examine the...