# 
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, was 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. Al 
improvement 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 waters of Avon, Livingston County, 
N.Y. have long been known and were used even by the aborigines, in ¢u- 
taneous disorders. Of late, they have been much frequented by the pont, 
of valetudinarians, who resort to similar places for health and p 
and in many diseases they have proved to be of the most decided ater 
_ Dr. Salisbury, who is a resident physician at Avon, has devoted him- 
= self to studying the chemical, constitution and medicin: qualities of these 
He finds their temperature not above 45° to Be which is about 
the usual temperature of wells and springs in that climate. The chemical 
tion eee “Tower spring,” as it is called, from its position, “ is by 
n 8000 pa phurie acid, 493, carbonic acid, 
1.36; ; nitrogen and | oxygen, . 272; chlorine, ae; sulphuric acid, 10.116; 
carbonate of lime, 4.08’; lime, 3.86 ; soda, 84; magnesia, 2.31 ; spe- 
cific gravity, 10.018. 
Arranged so as to form the compounds existing in this bi se and cal- 
culated for 10,000 parts by weight, are— —_. 
Carbonate of lime, 
united to carbonic acid, —- 
Chloride of calcium, —__- » 
Bist of lime, - a 
magnesia, - 
* soda, - dit ih 
Ina volume of 10,000 parts, are— 
ASE acids «. c's; 
