482 Scientific Intelligence. 
11. Note by W. Gootp Levison, on the Sand Filter described in 
American Journal of Science, September, 1870, page 241.* (Com- 
municated.)—A glass rod of a litt arger diameter than the 
aperture in the neck of the funnel is chet out to a slender thread 
as shown below. 
\ pips 
of —< fe 
| sp 
This is —— cut off by the file at the points a, 6 and e, forming 
two pieces. The large end of such a piece being held in | 
the tenes soon Dinaiiean globular etext forming a pear of glass. 
When this is dropped in the funnel the long stem rests against 
its side. If the funnel be of very thin glass, so as to weigh but 
little, and the end of the stem be fused fast to its rim, no jar will 
loosen the sand or precipitate, and it forms, probably, the most 
convenient filter for drying precipitates at a temperature that 
would char paper. 
Il. GEoLoGY AND MINERALOGY. 
1. Note upon the history and value of the term “Hudson ese 
in American Geological Nomenclature; by ES 
Hart. (Proc. Amer. Assoc., Nashville meeting, aR ie: 187 1. oat 
The term Hudson River Gr roup was employed in the Reports of 
the New York Geological Survey for the shales and slates over- 
pins the Trenton limestone. Later it was urged by Sir William 
ha = partially admitted by Mr. Hall, that the slates of the 
Riv 
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through the counties of Washington, Rensselaer, and Columbia, | 
its eastern limit approaching the river near Rhinebec k; and he 
rightly says, that there is no goo od reason for abandoning the old 
ooh “ Hudson River Grou 
2. Paleontological Report of ci Princeton Scientific Expedi- 
tion of 1877; by Henry F. Osnorn, Wm. B. Scorr and Francis 
Sperr, Jr. 146 Sriepe the Re here 10 meee 1878.—The expedition 
from Princeton summer to Colorado and Wyoming 
returned with large Sear valuable collections of fossils as this 
Report abundantly shows. The Colorado collections were made 
in the beds near Florissant, supposed to be Miocene, and in 
a near the Garden of the Gods “referred to the Dakota and 
title of the article, here referred to, Mr. Goold Levison’s name is 
Fibre” seats in two of its letters. 
