CHAPTER 15.. 1847-1850: Age 40-43.

1847-1850: AGE 40-43.

Excursions on Coast Survey Steamer.--Relations with Dr. Bache, the Superintendent of the Coast Survey.--Political Disturbances in Switzerland.--Change of Relations with Prussia.--Scientific School established in Cambridge.--Chair of Natural History offered to Agassiz.--Acceptance.--Removal to Cambridge.--Literary and Scientific Associations there and in Boston.--Household in Cambridge.--Beginning of Museum.--Journey to Lake Superior.--" Report, with Narration."--"Principles of Zoology," by Agassiz and Gould.--Letters from European Friends respecting these Publications.--Letter from Hugh Miller.--Second Marriage.--Arrival of his Children in America.