108 Correspondence of J. Nickles. 
It should be recollected that the Hudson river group, in its 
typical localities in the Hudson river valley, are still the slates 
under discussion ; and so long as the investigations were from 
this line eastward, we were working upon rocks of the same age, 
viz: the “first grawacke” and the “slates of the first grawacke” 
and “sparry limestone” of Eaton. The errors that have arisen 
have not been from the identification of the Hudson river group 
in its typical localities with the slates on the east, but from re 
garding the rocks on the west as identical with those of the Hud- 
son river valley at and below Albany. ae 
In order to a correct understanding of the questions at issue, 
an impartial historical sketch of the progress of the investiga 
tions would be of much service at this time. 
T am very respectfully yours, JAMES HALL. 
Albany, N. Y., Dec. 19, 1861. 
Art. XVI.— Correspondence of Jerome Nicklés, dated Nancy, Frantt, 
Vov. 6, 1861. 
Obituary. Pierre Berruter, the oldest of French mineralogists, died 
at the age of 79 years, on the 29th of August last, of paralysis, which for 
re than four years has interrupted his labors. Every chemist. and 
mineralogist is familiar with his “ Traité des Essais par la Voie Séche 
which rendered great service to analytical chemistry and metallurgy and 
of Mines, which he left in 1801 
oparD.—This most zealous defender of the rights of intellectual 
roperty, died at Brussels, October 26, 1861, at the age of 79 yeal® 
e was born at Baissey, a village of the department of Haute-Marne 2 
1792. He was Director of the Industrial Museum, (Musée de [Indus 
trié,) an office created after Belgium separated from Holland, soon aftet 
the French revolution of 1830. 
When Belgium revived her constitution new men became necessary 
and for the most part new ideas. Jobard drew up the plan for # 
Museum of Industry and presented it to the Chamber of Representative 
They accepted it and intrusted the author with the execution of thé 
pointed Director of the Museum, and after a life of struggles acq 
thus a position which farnisked him a support for his latter days. 
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