iv CONTENTS OF THE INTRODUCTION. 
typical. The progress of discovery proved that 
the “ Lower Silurian” Sections were put by the 
Author of the “System” in a false relation to 
the Upper Cambrian groups, p. xlvii., and note 
to p. xlvili. The Corndon Sections no excep- 
tions to this remark, note to p. xlvii. To cover 
this mistake he destroyed his own base line and 
included Cambria in Siluria. Cambrian nomen- 
clature never abandoned. Tampered with by 
Mr Warburton, pp. 1. li. Incongruity and in- 
justice of the whole proceeding, note to p. lii. 
The extended Silurian nomenclature an abandon- 
ment of the sections which formed the basis of 
the Silurian evidence, and also an abandonment 
of the principles affirmed in the “ Silurian Sys- 
tem.” The nomenclature of the Tabular View 
is, on the contrary, derived from a true analysis 
of the physical groups—is sectionally and paleeon- 
tologically true—is geographically consistent, and 
has the undoubted right of priority, pp. lii—hii. 
Other schemes of classification and nomenclature 
applied to the Cambrian Series. All schemes 
fail without a true determination of the physical 
groups.—In what respects the ‘‘ Silurian System” 
succeeded as a good scheme of nomenclature— 
in what respect it failed, pp. liv.—lvi.—True 
nomenclature not to be derived from erroneous sec- 
tions, p. lviili—The Caradoc group erroneous—The 
Llandeilo group entirely out of place ; the Russian 
nomenclature consequently erroneous—First prin- 
ciples not to be deserted—least of all among the 
older Palzeozoic Rocks, pp. Ix. ]xi. 
First principles deserted in the incorporation of 
Cambria into Siluria. Principles of true induc- 
tion deserted, note to p. lxi. True principles of 
classification maintained by the author of the 
“Silurian System” till it was proved that the 
lower Silurian Sections were wrong. True prin- 
ciples then deserted, pp. Ixi, Ixii, Cambrian 
nomenclature unfairly tampered with, p. Ixiv. 
Mistaken classification of the Government Sur- 
vey. How it originated, p. Ixv. Silurian nomen- 
clature first accepted in the belief that the Lower 
Silurian Sections were true, in ignorance of the 
real structure of Wales, and of the true Silurian 
base (the May Hill Sandstone), pp. Ixvi. Ixvii. 
No longer any rational ground of controversy. 
Moral arguments. British Association, pp. Ixviii. 
Ixix. 
Passage in the President’s Anniversary Address 
(1843), pp. Ixx. Ixxi. Erroneous statement of 
Mr Sharp not corrected, Ixxii. Virtually re- 
peated in “ Siluria,” 1854, p. Ixxiii. Mistakes in 
the Silurian Sections not imputed to their real 
author, p. Ixxiv. Answer required to a plain 
question of fact, p.Ixxv. No fatal mistake in 
the Cambrian Sections of the Tabular View. The 
author of the Silurian System (while continuing 
a nomenclature originally based on erroneous 
sections) has twice changed his ground. Now 
appeals to a new interpretation of an old section. 
Argument a mere sophism, p. Ixxvi. Unfair ad- 
vocacy, p. Ixxvii. Silurian prototype, pp. Ixxviii.— 
Ixxix. No Silurian Section a prototype of Cam- 
bria. True geographical names changed, in order 
to preserve erroneous names derived from erro- 
neous Sections. Note to p. Ixxix. Scheme 
geographically and paleontologically untrue, 
p. Ixxx. Conclusions. 
An important correction overlooked, and consequent 
errors in the ivth Chapter of “ Siluria,” p. Ixxxi. 
Lower Silurian Sections not a key to the classi- 
fication of the older Paleeozoic rocks of the North 
of England, p. Ixxxii. Skiddaw Slate, p. Ixxxiii. 
Supplemental note, with quotations from the “ Silu- 
rian System,” p. Ixxxv. 
Supprement, p. lxxxvili, Recapitulation, pp. 1xxxix. 
and xe. 
Discussions before the Geological Society, pp. 
xci. and xcii. 
Mr. Greenough and Sir H. De la Beche. Condition 
of the Woodwardian Museum, pp. xcii. xciii. 
Postscript, p.xciv. Classifications in the Manual 
of Professor Phillips examined, pp. xev. and xevi. 
Cambrian strike. 
Succession of the older Palzeozoic rocks of North 
America, p. X¢evil. 
Statement of Professor H. Rogers. France, p. xeviii. 
