48 Pages in Charles Darwin's Library associated with "intermediacy, gradation: 'gradualism'"

Contributions to the natural history of the United States of North America.
By: Agassiz, Louis,
Publication info: [s.n.] :[s.n.],n.d..
Pages: Page 194 Page 195
Essais de zoologie générale
By: Geoffroy Saint-Hilaire, Isidore,
Publication info: Paris :Roret,1841.
Volume: Zoologie générale (1841)
Pages: Page 434
Histoire générale et particulière des anomalies de l'organisation chez l'homme et les animaux.
By: Geoffroy Saint-Hilaire, Isidore,
Publication info: Paris :J.B. Baillière,1832-1837.
Volume: v.3
Pages: Page 608
Histoire naturelle générale des règnes organiques.
By: Geoffroy Saint-Hilaire, Isidore,
Publication info: Paris :Victor Masson,1854-1862.
Volume: v.2
Pages: Page 418
Intermarriage.
By: Walker, Alexander,
Publication info: London :Churchill,1838.
Pages: Page 281 Page 282
Leçons de botanique.
By: Saint-Hilaire, Auguste de,
Publication info: Paris :P.J. Loss,1841.
Pages: Page 35 Page 36 Page 515 Page 516 Page 548 End Slip 1 End Slip 1
A manual of elementary geology.
By: Lyell, Charles.
Publication info: [s.n.] :[s.n.],1855.
Pages: Page 258
On the genesis of species.
By: Mivart, St. George Jackson,
Publication info: London :Macmillan & Co.,1871.
Pages: Page 21 Page 37 Page 38 Page 97 Page 105 Page 107 Page 112 Page 232 Page 240 End Slip 2, side 2
On the nature of limbs.
By: Owen, Richard,
Publication info: London :John Van Voorst,1849.
Pages: Page 86 Page 86
On the variation of species.
By: Wollaston, Thomas Vernon,
Publication info: London :John Van Voorst,1856.
Pages: Page 158 Page 158 Page 165 Page 165
Principles of comparative physiology.
By: Carpenter, William Benjamin,
Publication info: London :John Churchill,1854.
Pages: Page 319 Page 320 Page 325
Principles of geology.
By: Lyell, Charles.
Publication info: London :John Murray,1837.
Volume: v.2
Pages: Page 376 Page 376 Page 139 Page 139 Page 162 Page 163
Studien zur Descendenztheorie. I.
By: Weismann, August,
Publication info: Leipzig :Engelmann,1875.
Pages: Page 16 Page 16
Studien zur Descendenztheorie. II. über die letzen Ursachen der Transmutationen.
By: Weismann, August,
Publication info: Leipzig :W. Engelmann,1876.
Volume: v.2
Pages: Page 192
über den Einfluss der Isolirung auf die Artbildung.
By: Weismann, August,
Publication info: Leipzig :W. Engelmann,1872.
Pages: Page 41 Page 41 Page 42 Page 42
über Raçen der landwirthschaftlichen Hausthiere.
By: Sturm, Carl Christoph Gottlieb.
Publication info: Ebberfeld :Büscher,1825.
Pages: Page 115