TO OUR READERS AND: CORRESPONDENTS. 



The coals of the vicinity of Bath are very sulphureous — perhaps it is 

 their vapour, and not their light which bleaches Arabella's dresses. The 

 steam of 300° must be issuing- with arreat violence from a small aperture ; 

 expansion then so mud* increases its capacity for heat that it does not 

 scald till the r^ sSure is considerably diminished. Although the steam in 

 the boiler may be 300°, that which first issues is not above 190°. 



Mr. W. Jones informs us that, in 1822, he proposed to Messrs. Symons 

 and Co., of Leman-street, a plan precisely similar to Mr. Jeffrey's, for the 

 condensation of smoke : we should be glad to know whether there, or else- 

 where, it has been successfully carried into effect ? 



Captain Jeremie's observations on East India opium have been received, 

 but the sample has not yet reached us. 



H. M. is informed that ice evaporates, as well as water. 



The hints of our Correspondent at Dover shall be attended to. He is 

 surely wrong respecting our general index. 



In reply to a letter dated " Somerset, 22d September, 1825," we refer 

 to what is called a Fossil Human Skeleton, preserved in the British 

 Museum ; and to Mr. Konig's paper on the subject, published in the Phi- 

 losophical Transactions. 



Mr. Van Rensselaer's communication has been received ; his former one 

 never came to hand. 



We must again decline publishing the Letter of F.R.S., inasmuch as 

 he reasons upon wrong grounds. The Library of the Royal Institution, 

 as well as that of the Royal Society, are both easily accessible, and under 

 certain restrictions, the Fellows of the Society arc allowed to take books 

 from the latter. 



Several instruments have been invented for the destruction of calculi 

 upon the principle of Colonel Martine's, but there are very few cases 

 which admit of their use. 



Communications have been received from Dr. Johnson, Dr. Ure, Mr. 

 Gregory, Mr. Stromeyer, Mr. Faraday, and Mr. Horner. 



A copious General Index to the Contents of the first 

 Twenty Volumes of this Journal, which are now com- 

 pleted, is ready for the Press, and will be delivered with 

 the next Number. 



