1817.] during the Year 1816. 49 
ammonia, and by long continued boiling almost the whole of the 
ammonia may be driven off. According to Gmelin’s analysis, it is 
composed of 
WBOTACIC ACID Pees ccs ayers oe onOS A. (ccc OO 
IN IMONIAe eae sais ss) DSSEE Meas 9°30 
Water cee ee ssmae cc. ss SOF 
100°0 
He considers it as a triborate, or as composed of three atoms of 
boracic acid and one atom of ammonia combined with 10 atoms of 
water. 
By mixing solutions of borax and sulphate of magnesia, and 
setting aside the mixture to undergo spontaneous crystallization, 
Gmelin obtained two remarkable double salts, consisting of a com- 
bination of borax and sulphate of magnesia in two different propor- 
tions. (See Schweigger’s Journal, xv. 245.) 
XIII. MINERAL WATERS. 
_ 1. Mineral Water of Caversham, in Berkshire.-—An anonymous 
correspondent has published in the Annals, viii. 123, an analysis of 
a mineral water at Caversham, in Berkshire, hitherto overlooked by 
medical men. He finds the constituents as follows :—300 cubic 
inches contain, of gaseous contents, 
Carbonic acid........¢.....++s 38 cubic inches 
Sulphureted hydrogen ........ 4 
37 
Of solid contents, 
Carbonate of soda ..e+..++++++ 10 grains 
Moariate 06 S008 nf sini ese:p00 4 «As 
Carbonate of iron .....e2+++.+ 18 
Carbonate Of Mime. a ccs abieeceie ee 2 
43 
This mineral water would probably be found useful as a stomachic, 
Perhaps none of the acidulous waters of Great Britain contains a 
greater proportion of carbonic acid gas. 
2. Tunbridge Wells Water —We are indebted to Dr. Scudamore 
for a new a accurate analysis of the celebrated mineral spring at 
Tunbridge Wells, of which a short account has been given in the 
Annals, viii. 149. A gallon of the water was found to contain 
Of gaseous matter........ 13°3 cubic inches 
Of saline matter ........ 7°68 grains 
The gaseous matter consisted of 
Carbonic acid .........+++++-+ 8°05 cubic inches 
OSygen 00 cis 00 29.9 2)0 009 08000 0'OO 
Azote eeeveeeeeeeoeeaeoeeaneeee 4°75 
Vor. IX. N° I, D 
