12 Tin American Geologist. -Ian. i89i 
was the oldest sedimentary rock in the State, until I was obliged by 
ocular demonstration to acknowledge I was wrong, and as far as in my 
power 1 have corrected the error ; and of course I feel it my duty to as- 
sist professor Emmons to the extent of my ability : and J was delighted 
to learn he lias more powerful and efficient friends. 
I was pleased to learn your opinion that the Potsdam sandstone 
should be placed in the Taconic, for I have ever thought it belonged to 
the Bottom rocks. 
I should be very happy to see you in this city and show you 
among other things the fossils collected from the Taconic system. 
1 am, dear sir, with great respect your obedient servant, 
E. Jewett, 
•Jules Marcou, Esq., Boston. Curator Nat. Hist. 
Geological "Rooms, Albany. January 23, 1861. 
My Deah Sin : 
Please accept my very sincere thanks for your kind letter and valued 
work on "Geology of the United States and the British provinces of 
North America," Boston, 1853, which came yesterday. 
The "Geology of " I read carefully soon after it, was published 
but was so stupid or unfortunate a's to think it a work of great value 
and still continue in the opinion. I was not surprised that it was at- 
tacked by professor Hall — no work of the kind escapes him * *- * 
Hut just now he has enough on his hands to sustain his false theory in 
relation to our rocks and he will find it a herculean labor to keep out of 
sight more than three-fourths of our sedimentary strata. I am told 
* * * that he now thinks more of stratigraphy and less of palaeon- 
tology than before Sir William E. Logan published his letter! (Re- 
marks on the fauna of the Quebec group of rocks and the Primordial 
zone of Canada addressed to Mr. Joachim Barrande," Montreal. 3rd 
January, ISOI). He observed that if Sir William's account is tru< 
geology is all afloat. We shall probably see in the .March number of the 
Journal of Science some fine special pleading. (A letter of Mr. Hall to- 
the Editors, continues his opposition to the "scheme of Barrande in 
reference to the successive faunae of trilobites. as established in Bohe- 
mia and the rest of Europe."") 
I have little doubt but Emmons will cordially agree with you in rela- 
tion to the Potsdam sandstone. I had a talk with him on the subject 
and the trilobites of Owen from it and now think his opinion agrees 
with mine. He is exceedingly obliged to you for the very efficient as- 
sistance you have rendered him. Emmons is a man of sterling worth 
and integrity and by having been placed in a wrong position by sharp 
practice and maneuvering in a lawsuit where he was only a witness, 
has been the best abused, man in America, and all without cause, [It 
was in regard t<> a publicatii f a great Geological Tabular view for 
t he schools of New York'.| 
Mall says thai Sir William (Logan) has not endorsed the Taconic sys- 
t em : but as you observe he will be Obliged to do so. His letter to Bar- 
