Miscellanies. 401 
exchange minerals ; and mentioned a catalogue of his collection you 
had received. ‘The successors of Mr. Moldenhauer are David and 
Adolph Zimmern; and their establishment seems to be connected 
with the University in that city, as a Mineralogical Institute. In a 
box of minerals recently received from them, came enclosed a new 
edition of their Catalogue of Minerals, and a list of rock specimens 
and petrifactions, which they are preparing for sale. As these gen- 
tlemen appear to be honorable dealers, (of which several others, as 
well as myself, have had conclusive proof, in valuable returns from 
them,) and as I know of no other place where such a collection of 
fossils can be obtained, I thought your readers might be = by 
a translation of their prospectus, which I give below. 
Collections of Rocks and Petrifactions by ess at the Mineral | 
Store in Heidelberg 
a December, 1826, we informed the silts of our project, to fur- 
nish by parcels, collections of rocks and petrifactions at a moderate 
price 5 thus enabling the lovers of the science to possess the most 
important varieties of rocks, as well as a certain number of petrifac- 
tions, which are so important in their relations to the rocks. — . 
We then calculated upon the success of an enterprize, in which 
we had more respect to a love of the science, than toa lucrative | 
speculation. We thought ourselves sure of a demand for sixty col- 
lections, to cover the considerable expense of that undertaking. The 
success has much surpassed our expectation. The first two par- 
cels, of which the greater part of the specimens were already ob- 
tained, were with difficulty got ready for delivery in December, 
1827; at which time we had received orders from establishments i in 
Holland, Italy and Russia, and from a great number of amateurs, 
both in Germany and abroad. ‘These first parcels proved that we 
had spared no pains to keep our promise; and ever since, the spe- 
cimens which remained, have met with aready sale. Encouraged by 
the satisfaction which was generally expressed, and by the new or- 
ders which we could not supply, we have determined to announce a 
second edition of collections of rocks and petrifactions by parcels. 
The conditions of this new undertaking are essentially the same as 
the first; we recapitulate them here. 
1. It is known how difficult it is to furnish collections of rocks, 
nearly complete, in the expectation that they will afford an ‘Object for 
pecuniary speculation.. 
Vou. XVIL—No. 2. 24 
