CHAPTER 12.

1843-1846: AGE 36-39.

Completion of Fossil Fishes.--Followed by Fossil Fishes of the Old Red Sandstone.--Review of the Later Work.--Identification of Fishes by the Skull.--Renewed Correspondence with Prince Canino about Journey to the United States.--Change of Plan owing to the Interest of the King of Prussia in the Expedition.--Correspondence between Professor Sedgwick and Agassiz on Development Theory.--Final Scientific Work in Neuchatel and Paris.--Publication of "Systeme Glaciaire."--Short Stay in England.--Farewell Letter from Humboldt. --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 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.

Return to Cambridge.--Removal of Collection to New Museum Building. --Distribution of Work.--Relations with his Students.--Breaking out of the War between North and South.--Interest of Agassiz in the Preservation of the Union.--Commencement of Museum Publications. --Reception of Third and Fourth Volumes of "Contributions."--Copley Medal.--General Correspondence.--Lecturing Tour in the West. --Circular Letter concerning Anthropological Collections.--Letter to Mr. Ticknor concerning Geographical Distribution of Fishes in Spain.

CHAPTER 20.

1863-1864: AGE 56-57.

Correspondence with Dr. S.G. Howe.--Bearing of the War on the Position of the Negro Race.--Affection for Harvard College. --Interest in her General Progress.--Correspondence with Emerson concerning Harvard.--Glacial Phenomena in Maine.

CHAPTER 21.

1865-1868: AGE 58-61.

Letter to his Mother announcing Journey to Brazil.--Sketch of Journey.--Kindness of the Emperor.--Liberality of the Brazilian Government.--Correspondence with Charles Sumner.--Letter to his Mother at Close of Brazil Journey.--Letter from Martius concerning Journey in Brazil.--Return to Cambridge.--Lectures in Boston and New York.--Summer at Nahant.--Letter to Professor Peirce on the Survey of Boston Harbor.--Death of his Mother.--Illness. --Correspondence with Oswald Heer.--Summer Journey in the West. --Cornell University.--Letter from Longfellow.

CHAPTER 22.

1868-1871: AGE 61-64.

New Subscription to Museum.--Additional Buildings.--Arrangement of New Collections.--Dredging Expedition on Board the Bibb.--Address at the Humboldt Centennial.--Attack on the Brain.--Suspension of Work.--Working Force at the Museum.--New Accessions.--Letter from Professor Sedgwick.--Letter from Professor Deshayes.--Restored Health.--Hassler Voyage proposed.--Acceptance.--Scientific Preparation for the Voyage.

CHAPTER 23.

1871-1872: AGE 64-65.

Sailing of the Hassler.--Sargassum Fields.--Dredging at Barbados. --From the West Indies to Rio de Janeiro.--Monte Video. --Quarantine.--Glacial Traces in the Bay of Monte Video.--The Gulf of Mathias.--Dredging off Gulf of St. George.--Dredging off Cape Virgens.--Possession Bay.--Salt Pool.--Moraine.--Sandy Point. --Cruise through the Straits.--Scenery.--Wind Storm.--Borja Bay. --Glacier Bay.--Visit to the Glacier.--Chorocua Bay.

CHAPTER 24.

1872: AGE 65.

Picnic in Sholl Bay.--Fuegians.--Smythe's Channel.--Comparison of Glacial Features with those of the Strait of Magellan.--Ancud. --Port of San Pedro.--Bay of Concepcion.--Three Weeks in Talcahuana.--Collections.--Geology.--Land Journey to Santiago. --Scenes along the Road.--Report on Glacial Features to Mr. Peirce. --Arrival at Santiago.--Election as Foreign Associate of the Institute of France.--Valparaiso.--The Galapagos.--Geological and Zoological Features.--Arrival at San Francisco.

CHAPTER 25.

1872-1873: AGE 65-66.

Return to Cambridge.--Summer School proposed.--Interest of Agassiz. --Gift of Mr. Anderson.--Prospectus of Penikese School. --Difficulties.--Opening of School.--Summer Work.--Close of School. --Last Course of Lectures at Museum.--Lecture before Board of Agriculture.--Illness.--Death.--Place of Burial.

LIST OF ILLUSTRATIONS.

1. PORTRAIT OF LOUIS AGASSIZ AT THE AGE OF NINETEEN; copied by Mrs. John W. Elliot from a pastel drawing by Cecile Braun.

2. THE STONE BASIN AT MOTIER; drawn by Mrs. Elliot from a photograph.

3. THE LABORATORY AT NAHANT; from a drawing by Mrs. Elliot.

4. THE BIRTHPLACE OF LOUIS AGASSIZ; from a photograph.

5. HOTEL DES NEUCHATELOIS; copied by Mrs. Elliot from an oil sketch made on the spot by J. Burkhardt.

6. PORTRAIT OF JACOB LEUTHOLD; from a portrait by Burkhardt.

7. SECOND STATION ON THE AAR GLACIER; Copied by Mrs. Elliot from a sketch in oil by J. Burkhardt.

8. PORTRAIT OF LOUIS AGASSIZ AT THE AGE OF FIFTY-FIVE; originally published in "Nature".

9. COTTAGE AT NAHANT; from a photograph.

10. MUSEUM OF COMPARATIVE ZOOLOGY; from a photograph.

11. PORTRAIT BUST OF AGASSIZ BY POWERS AT THE MUSEUM OF COMPARATIVE ZOOLOGY; from a photograph.

12. VIEW OF PENIKESE; from a photograph.