--Sails for United States.

CHAPTER 13.

1846: AGE 39.

Arrival at Boston.--Previous Correspondence with Charles Lyell and
Mr. John A. Lowell concerning Lectures at the Lowell Institute.
--Relations with Mr. Lowell.--First Course of Lectures.--Character
of Audience.--Home Letter giving an Account of his first Journey in
the United States.--Impressions of Scientific Men, Scientific
Institutions and Collections.

CHAPTER 14.

1846-1847: AGE 39-40.

Course of Lectures in Boston on Glaciers.--Correspondence with
Scientific Friends in Europe.--House in East Boston.--Household and
Housekeeping.--Illness.--Letter to Elie de Beaumont.--Letter to
James D. Dana.

CHAPTER 15.

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