Strahleck and the Siedelhorn.--Visit to England.--Search for
Glacial Remains in Great Britain.--Roads of Glen Roy.--Views of
English Naturalists concerning Agassiz's Glacial Theory.--Letter
from Humboldt.--Winter Visit to Glacier.--Summer of 1841 on the
Glacier.--Descent into the Glacier.--Ascent of the Jungfrau.

CHAPTER 11.

1842-1843: AGE 35-36.

Zoological Work uninterrupted by Glacial Researches.--Various
Publications.--"Nomenclator Zoologicus."--"Bibliographia Zoologiae
et Geologiae."--Correspondence with English Naturalists.
--Correspondence with Humboldt.--Glacial Campaign of 1842.
--Correspondence with Prince de Canino concerning Journey to United
States.--Fossil Fishes from the Old Red Sandstone.--Glacial
Campaign of 1843.--Death of Leuthold, the Guide.

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.