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CONTENTS. 
PAGE 
CHAPTER XXVI. 
On the stratified rocks usually called 'primary'— Proofs from the dispo- 
sition of their strata that they were originally deposited from water — Alter- 
nation of beds varying in composition and colour — Passage of gneiss into 
granite — Alteration of sedimentary strata by trappean and granitic dikes 
Inference as to the origin of the strata called 'primary' Conversion of argil- 
laceous into hornblende schist— The term 1 Hypogene' proposed as a substitute 
for primary — 6 Metamorphie ' for ' stratified primary ' rocks — No regular order 
of succession of hypogene formations— Passage from the metamorphie to 
the sedimentary strata— Cause of the high relative antiquity of the visible 
hypogene formations— That antiquity consistent with the hypothesis that 
they have been produced at each successive period in equal quantities — Great 
volume of hypogene rocks supposed to have been formed since the Eocene 
period— Concluding remarks . . „ . , 355 
Table I. Showing the relations of the various classes of rocks, the Alluvial, 
the Aqueous, the Volcanic, and the Hypogene, of different periods 386 
Table II. Showing the order of superposition of the principal European 
groups of sedimentary strata mentioned in this work . . 389 
Notes in explanation of the Tables of fossil shells in Appendix I. .'' 395 
Appendix I. Tables of fossil shells by Monsieur G. P. Deshayes » 1 
Appendix II. Lists of fossil Shells chiefly collected by the author in Sicily 
and Italy, named by M. Deshayes . . .53 
Glossary, containing an explanation of geological and other scientific terms 
used in this work . . • . . .61 
Index . . , , 85 
