— 256 Letter from Sir R. I. Murchison on 
~ 
ArT. XXXI.—Notice of a Memoir by M. Jules Marcou, entitled 
: ope, Nort 
MURCHISON to the Editors.) 
Genilemen— 
In the early part of last winter I read with surprise the fol- 
lowing paragraph in a published letter by M. Jules Marcou on » 
-American Geology. “I think that the term Permian, at least 
Considering this to be a serious charge, I wrote to M. Marcou 
and begged to know the grounds on which he had made it. AS 
he had never been in Russia, I-called his notice to another ex-~ 
pression in his own letter on American geology in which he 
—_ “not having visited Kansas or Nebraska I have no de- 
cided opinion respecting the geology of those countries; for I 
profess the doctrine that geologists must see with their own 
eyes,” &c. I further expressed a wish, that M. Marcou had 
acted on his own doctrine, as respected Russia, before he p 
so severe a judgment on the researches of M. de Verneuil, Count 
Keyserling and myself. The replies sent to me by that gentle- 
man, though very polite, being by no means satisfactory, i 
stated to him my intention of publishing our correspondence 12 
your journal. But I abstained to do so until M. Marcou had 
produced a fuller explanation of his views. 
a study of the original work of my friends and self, M. 
Marcou has at length produced his results in the Bibliothéque 
Universelle de Genéve under the title of which a translation 18 
tion between the fossils of the Permian group or Dyas of M. — 
Marcou and those of the Trias is much more sharply defined 
* Bibliothéque Universelle de Genéve, Mai et Juin, 1859. 
