188 Miscellanies. 



num ; the gases pass through, one within the inner tube, and the other 

 along the space between the two ; so that no mixture or communication 

 can take place until they arrive at the outlet. There is another advan- 

 tage attending this arrangement, viz. that either of the gases can be made 

 to surround the other, at pleasure ; and any quantity of the gases can be 

 employed, and large masses of platinum can be melted. This jet was 

 contrived by Professor Webster, of Cambridge, Mass. in 1824, who sent a 

 drawing and model of it to Mr. Newman, the well known maker of philo- 

 sophical instruments, in London, by whom a jet was made and sent over, 

 which Dr. W. has continued to use in his lectures and on all occasions, 

 ever since, with perfect safety. A jet, on the same principle, vv as previ- 

 ously devised by Dr. W. and figured in his Manual of Chemistry, edit. 1 

 and 2. This was wholly of brass, and made by Dwelle, of Boston. An 

 impi-ovement was made by introducing one of the gases into the end of 

 the central tube, instead of the side. 



13. Analysis of the Mineral Waters of Avon. By Samuel Salisbury, 

 Jr. M. D. 1838. — The sulphureous watej-s of Avon, Livingston County, 

 N. Y. have long been known and were used even by the aborigines, in cu- 

 taneous disorders. Of late, they have been much frequented by the throng 

 of valetudinarians, who resort to similar places for health and pleasure : 

 and in many diseases they have proved to be of the most decided utility. 



Dr. Salisbury, who is a resident physician at Avon, has devoted him- 

 self to studying the chemical constitution and medicinal qualities of these 

 springs. He finds their temperature not above 45° to 47°, which is about 

 the usual temperature of wehs and springs in that climate. The chemical 

 constitution of the "lower spring," as it is called, from its position, " is by 

 weight in 8000 parts of water, hydro-sulphuric acid, 493 ; carbonic acid, 

 1.36; nitrogen and oxygen, .272; chlorine, .73; sulphuric acid, 10.116; 

 carbonate of lime, 4.08; lime, 3.86; soda, .84; naagnesia, 2.31; spe- 

 cific gravity, 10.018. ^ 



Arranged so as to form the compounds existing in this water, and cal- 

 culated for 10,000 parts by weight, are — 



Carbonate of lime, - - - - 5.02 



united to carbonic acid, - - - 1.70 — 6.72 



Chloride of calcium, - ----.'" ~ -^ 1-44 



Sulphate of lime, - - -• -' - 9.83 



" magnesia, - - - - 8.49 



soda, - - - - - 2.35 



28.83 

 In a volume of 10,000 parts, are — 



Hydro-sulphuric acid, . . - 434 



Nitrogen, - - - - - 235 



Oxygen, - - - - - 25 



694 



