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 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. CHAPTER 16. 1850-1852: AGE 43-45. Proposition from Dr. Bache.--Exploration of Florida Reefs.--Letter to Humboldt concerning Work in America.--Appointment to Professorship of Medical College in Charleston, S.C.--Life at the South.--Views concerning Races of Men.--Prix Cuvier. CHAPTER 17. 1852-1855: AGE 45-48. Return to Cambridge.--Anxiety about Collections.--Purchase of Collections.--Second Winter in Charleston.--Illness.--Letter to James D. Dana concerning Geographical Distribution and Geological Succession of Animals.--Resignation of Charleston Professorship. --Propositions from Zurich.--Letter to Oswald Heer.--Decision to remain in Cambridge.--Letters to James D. Dana, S.S. Haldeman, and Others respecting Collections illustrative of the Distribution of Fishes, Shells, etc., in our Rivers.--Establishment of School for Girls. CHAPTER 18. 1855-1860: AGE 48-53. "Contributions to Natural History of the United States." --Remarkable Subscription.--Review of the Work.--Its Reception in Europe and America.--Letters from Humboldt and Owen concerning it. --Birthday.--Longfellow's Verses.--Laboratory at Nahant. --Invitation to the Museum of Natural History in Paris.--Founding of Museum of Comparative Zoology in Cambridge.--Summer Vacation in Europe. CHAPTER 19. 1860-1863: AGE 53-56.