Heidelberg Collectionof Rocks and Petrifactions 399 
rose de Buzareingues maintains that sound is not generated by 
vibrations of the air, but depends on a peculiar fluid. An 
eulogy on Thomas Jefferson, who was an honorary member 
of the Paris Linnean Society, Tied before the Society 
by M. Lemesle, is published in the annals. M. Masson- 
Four has announced to the Society his intention of publish- 
ing in Paris a jeoneeton of Dr. Van Rensselaer’s Lectures 
on Geology, with 
e Chevalier Souange-Bodin, President of the Society, 
who has for several years devote his fortune and time to the - 
formation of a great ea ae establishment, solicits the 
aid of travellers, botanists, &c. of all countries, in eed 
ing to him roots, s, &c. of rare and interesti & plants. 
Packages may be forwarded to him, directed “ au ce 
M. M. Eyries fréres négocians ; Jardin de Fromont, a Mle 
Chevalier Soulange-Bodin, a Paris, rue St. Anne, No. 44,” 
C. 
Ill. Notice oft os ee collections of Rocks and Pex 
© faction ¥ 197, we pre that collec- 
ns of minerals te se obtained, either purchase or 
exchanee of Mr. Frederick Moldenhauer, A Heidelbere., 
Germany. We have recently ee a collection from him, 
and it is at his request, and in compliance with the wishes of 
Counsellor Leonard, Professor of mineralogy in the Univer~ 
sity of Heidelberg, as well as from a desire to promote the 
cause of mineralogy and geology, that we publish the follow- 
ing remarks, communicated from Heidelberg for insertion in 
this Journal, with letters from Prof, Leonard and Mr. Mol- 
dual 2 : 
a 
* 
We flatter ourselves that we shall render a service to the 
study of geology, by an undertaking, in which, as every com- 
petent judge must perceive, nothing ton the love of science 
would induce us to engage. It is well known that collections 
of rocks, somewhat complete, belong to a elass of objects not. 
easily acquirable ; because of their offering too small a pro- — 
fit in business, and being therefore unfit for mercantile specu- 
lations. But the acquisition of a large number of petrifac- 
tions, which determine the geological character of a forma- 
tion, was still more difficult, and even impossible until now ; 
notwithstanding that the actual state of science requires, that — 
th equal 
of every collection of — which is to be used wi 
