316 Scientific Intelligence. [Oct. 



experienced, have to urge on the consideration of the public, that 

 the interests of humanity are deeply concerned in its support. 



" It therefore requests the favour of your countenance and co- 

 operation, and the communication of any advice or information 

 that may assist it in forwarding its views. The proprietors and di- 

 rectors of the different mines in this kingdom are particularly re- 

 quested to communicate the courses and precautions now taken in 

 their different mines to obviate the mischiefs complained of, and 

 also the observations and amendments that may have occurred to 

 them." 



Communications and Subscriptions are received by Mr. Burn, of 

 South wick, near Sunderland, Durham, Secretary and Treasurer; 

 and it is requested that Subscriptions be remitted to the Wear Bank, 

 in Sunderland, or be named as soon as possible, as the Committee 

 are about to publish a Report, containing a comprehensive view of 

 the modes of ventilation now practised in the North of England; 

 and also propose, if their funds will enable them, to offer premiums 

 for the best treatises, or any farther important discovery or improve- 

 ment, that will effectually promote the object they have in view. 



Vil. Mineral Collections for Sale in Germany. 



(To Dr. Thomson.) 

 SIR, 



I take the liberty of requesting information, through the medium 

 of your Annals oj Philosophy, as to the value of the enclosed no- 

 tice ; and, if any persons in this country have become purchasers, 

 through what channel they procured the articles, and made the 

 payment for them. Any other information upon the subject of 

 specimens of minerals will be acceptable to several of your readers. 



I am, Sir, your obedient servant, 



London, Sept. 7, 1814. J. C. 



In the first number of the Medical and Physical Journal, pub- 

 lished by Drs. Bradley and Willich, in March, 1799, is the follow- 

 ing article of information. 



" The student of mineralogy will learn with satisfaction, that he 

 may be supplied from Leipzig with cal.inets containing specimens 

 of minerals arranged in systematic order, and at the following mo- 

 derate prices. 



" A collection of 150 specimens, each deposited in a separate 

 pasteboard case, and numbered corresponding to a catalogue, in 

 which a description is given of every piece, at six rix dollars Saxon 

 enrrency, or about \l. Is. British. A more extensive collection, 

 consisting of l'50 specimens of superior value, furnished with a 

 similar catalogue, and packed in drawers, in a red painted case, 

 witli lock, &c. for 20 rix dollars Saxon currency, or about 3/. 6s. Srf. 

 British. And lastly, a collection of the best specimens, amounting 

 to 500 in number, the produce of various countiies of Europe, many 

 of which are rare, and as yet non-descript, being recently collected j 



