Armstrong's Hydro-Electric Machines. 

 Messrs. WATSON & LAMBERT, 



OF 



w 



UPON TYNE, 



Who were entrusted by Mr. Armstrong with the manufacture of 

 the Hydro-Electric Machine now exhibiting at the Royal Polytech- 

 nic Institution in London, and who have the advantage of bein* ac- 

 quainted with every improvement which he has since made, beg to 

 announce to the public, that they make these Machines of a port- 

 able size, and heated with Coke, Charcoal, Gas, Spirit or Iron heat- 

 ers. The improvements which have recently been made in their 

 construction, have not only materially increased their power, but 

 have rendered them capable of being much more conveniently used 

 in a room, than they have hitherto been, and in point of economy 

 and power, Messrs. Watson h Lambert can confidently recommend 

 them as a substitute for the Glass Machines, over which they possess 

 the additional advantage of being in no degree influenced by the state 

 of the weather. 



Fixed Hydro-Electric Machines of all sizes, and every degree of 

 power, are also manufactured by Messrs. W. & L. 



Carliol Square, Newcastle on Tyne, (England,) 1844. 



OT 3 A list of the powers and prices may be obtained on applica- 

 tion to Messrs. Wiley & Putnam. 161 Broadwav. New York. 



Messrs. NESTLER & MELLE 



t Propose to establish in Hamburg, (Germany,) a Depot of Amer- 

 ican Books, which they will receive and sell on commission, — their 

 extensive connexions with the larger cities of Europe affording un- 

 gual facilities for that object. From the uncertainty of the demand 

 or American Books, they wish to receive, at present, of the older 

 Dorics only one copy ; but of those published during the last two 

 °nhree years, five or six copies; and the same number of all future 

 publications, — with catalogues, prospectuses, &c. 



Consignments may be made, free of cost, to Messrs. Moking &; 

 ^ of New York, or Mr. J. G. Ritter of Philadelphia. 



For further information, and catalogues, which are issued every six 

 m °nths, publishers are referred to Messrs. Moring &Co. New York. 



Hamburg, J une 13, 1844. 



Prof. Rogers's Address. 



The Address of Prof. H. D. Rogers before the Association of 

 tterican Geologists and Naturalists in May last, together with an 

 abstract of the Proceedings at the Washington meeting, (pp. 102, 

 Vo may be had on application, post-paid, to 



N B. SlLLIMAN, Jr. 



ew Hav en, October, 1844. 



NOTICE. 



R - Mantell has removed from Crescent Lodge, Clapham Common, 

 Chester Square, Pimlico, London, where he will continue to prac- 

 tlce a s Phy s i c i an and Surgeon. 



