2 Advertising Sheet of the 





For the purpose of advertising our stock more effectually, we have 

 published a systematic "Catalogue of Chemical Apparatus" This 

 extends to 100 pages large octavo, and is illustrated with 480 Wood 

 Cuts, mostly frotn original designs. The price of it is eighteen pence. 

 The Catalogue is written by J. J. Griffin, and contains descriptions 

 of nearly 2000 Instruments. It embraces also an account of pure 

 Chemical Reagents, Systematic Collections of Rocks, Fossils, Min- 

 erals, Models of Crystals, Models of Chemical Manufactories, and 

 other articles of interest to the Chemist and Geologist. The arti- 

 cles are so arranged that it is easy for the chemist to select such as 

 he may require for any given course of experiments. The sizes, 

 qualities, and prices of all the articles contained in the Catalogue 

 are precisely noted. Every thing is kept in stock, ready for imme- 

 diate delivery, and orders can be executed at a few hours' notice. 

 The instruments are warranted to be properly adjusted, and their 

 prices will be found to be unusually moderate. 



We respectfully point out to the chemists of America, that our 

 establishment presents to them advantages not to be found in.any 

 other establishment in Europe. We have collected the glass ves- 

 sels of the Paris chemists, the hard glass of Bohemia, the porcelain 

 of Berlin and Dresden, and the fine instruments of Berlin and Lon- 

 don. By making large purchases, we have procured the goods at 

 the lowest prices, and we have the whole ready for immediate ser- 

 vice. Freight from Glasgow to the United States is very cheap, 

 and the conveyance direct. We can therefore place quickly and 

 cheaply in the hands of the American chemist a collection of Chem- 

 ical Apparatus, Pure Reagents, Europan Minerals, &c. as complete 



as he can desire. 



RICHARD GRIFFIN 8c Co. 



Glasgow, Scotland. 



N. B. Griffin's Catalogue of Chemical Apparatus may be 

 procured of Mr. Linen, Bookseller, New York. 



MURCHISON'S SILURIAN SYSTEM. 



Messrs. WILEY & PUTNAM beg leave to inform American 

 Naturalists that Mr. Murchison has made such arrangements with 

 their London house, that they can now offer his splendid and im- 

 portant work on the "Silurian System," 2 volumes quarto, with 

 many plates and separate maps, large, minute, accurate, and beau- 

 tiful, and with numerous designs in the text, for the low price of £5 

 sterling, with only the cost of importation and duty added. The 

 work was published at £8, and the price has not been and will not 

 be lowered in England. Orders should be addressed to Wiley & 

 Putnam, 161 Broadway, New York. 



December 23, 1842. 



