Miscellanies. 401 



exchange minerals ; and mentioned a catalogue ol' 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 Hst 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 gratified by 

 a translation of their prospectus, which I give below. 



Collections of Rocks and Petrifactions by parcels, at the Mineral 

 Store in Heidelberg. 



In December, 1826, we informed the public of our project, to fur- 

 nish by parcels, collections of rocks and petrifactions at a moderate 

 price ; 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 to a 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 difliculty got ready for delivery in December, 

 1827 ; at which time we had received orders from establishments 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 a ready 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 sarn^ 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. 



Vol. XVU.— No. 2. 24 



