DYSLUITE DISCOVEUED BY AMERICAN MINERALOGISTS. 
37 
Chloride of sodium . . . , 
Chloride of calcium... 
Chloride of macjnesium. 
Sulphate of soda 
Sulphate of lime 
Carbonate of soda 
Carbonate of lime 
Carbonate of magnesia 
Iodine 
Penol. 
M uela. 
Ciruela 
Mogan. 
Quinchia 
81- 
65- 
59- 
59- 
83- 
9- 
0- 
14- 
0- 
0- 
I- 
0- 
14* 
0- 
0- 
0- 
31- 
0- 
37- 
9. 
9- 
0- 
13- 
0- 
0. 
0* 
4- 
0- 
1- 
0- 
0* 
5- 
0* 
2- 
8- 
0- 
0- 
0' 
1- 
0- 
trace 
trace 
trace 
trace 
trace 
1-00 
1-05 
1-00 
1-00 
I -00 
The valley of Magdalena possesses some 
iodine waters, and that of Cauca a great num - 
ber. 
On the plain of Mira is situated the base of 
the volcano of iCotoraxo. This plain is co- 
vered with sand and common salt, which is 
most probably derived from the subjacent 
trachyte, a rock containing glassy felspar 
imbedded in a basis of pyroxen. 
WATE 11 OF SONGR AGNE. - The tem- 
perature of this water is 7^'" C. (4 )g° F.) The 
soring is situated 706 metres (770§ yards) 
above the Mediterranean, and arises from a 
sandstone covered by secondary limestone. 
'J'he salts present with their water of crystalli- 
zation are, according to Berther,t Sulphate 
of soda 12'22, Sulphate of lime 5 85, Sul- 
phate of magnesia 4’6S, Chloride of potas- 
sium 2’37, Chloride of sodium 74'88. Total 
lOO’OO no trace of bromine or iodine could be 
3. SOULTZ, — This water has a specific 
gravity of 1‘2884, and contains Chloride of 
magnesium lo'84, Chloride of calcium G’19, 
Chloride of sodium 10 94, Chloride of potas- 
sium 2 08, Bromide of sodium 0’50, Total 35-55, 
II. ACIDULOUS WATERS.-I. Ue- 
berlingen on the borders of Lake Constance, 
possesses a copious acidulous spring, which 
has a temperature 1 to 12°, and a density 
of 1*0;>2, containing in the pound of 16 ounces, 
the following substances, by the analysis of 
Herberger- {Journ. de Pharm. xix. 192., 
Carbonic acid 266 6, cubic inches Azote 43-3) 
Proto-carbonate of iron 41'424, grams. Proto- 
carbonate of manganese 3-936, Sub-carbonate 
of soda 14-()00, Sulphate of soda 39'0l), Chlo- 
ride of calcium 30-280, Chloride of magne- 
sium !9-9'20, Matter containing azote 32-600, 
Carbonate of lime 88'52'), Alumina 6 000, 
Silica 32-001), Total 360‘880. _ 
The ochry substance which it deposits con- 
sists of Hydrous protoxide of iron 75-70, 
Oxide of manganese 00-3(>, Extractive mat- 
ter OO'fiO, Carbonate of lime 13‘ 45, Carbonate 
of magnesia 2’93, Silica and alumina 7'00, 
Total 100-00. ^ 
This water is employed as a tonic, 
2. CRAMAUX.— Its temperature is 4° 5' 
C. (40° V F.) 24 litres (l|galls.) analyzed by 
Lamothet afforded Carbonic acid g vol. Car- 
bonate of iron 50 gr. Sulphate of iron 12, Car- 
bonate of lime 48, Sulphate of lime 24, Muri- 
ate of lime 48, Muriate of potash 48, Sulphate 
of magnesia 7, Animal matter 3, Total 240, 
3. ACIDULOUS WATER OF C AM- 
BON.— M. Blondeau, {Journal de Pharm, 
xxi. 674 ) finds this water, which is situated 
in the department of Cantal, in a clay slate 
formation to contain Bi-rarbonate of soda, 
Carbonate of magnesia, Carbonate of lime, 
Sulphate of soda. Chloride of sodium. Carbo- 
nic acid, Traces of organic matter. 
HI. HOT SPRINGS. -In the neighbour- 
hood of the volcanoes of the Cordilleras, ac- 
cording to Boussingault, the temperature of 
thermal springs does not diminish with the 
altitude, from which it would appear, that 
the heat is derived from internal fires. They 
contain carbonates of lime and magnesia, 
chlorides of calcium, and sodium, sulphates 
of soda, lime, magnesia, traces of silica, car- 
bonic acid, and sulphuretted hydrogen gases, 
(Ann. de Chim. 52. 181.) 
IV. SULPHUREOUS WATERS.— 
WATERS OF ST. GENIS. -Professor 
Lavini procured from a litre (6TU2 cubic 
inches) of this water, 19 5 cubic centimetres, 
(LI? cubic inch) of carbonic acid, 5 (O'S cubic 
inch) sulphuretted hydrogen, and 17'5(1.05 
cubic inch) of azote, and the following 
solid contents in the same volume of water : 
Silica 0 0254 grams. Peroxide of iron 0-{j066, 
Alumina 0-0(H5, Carbonate of lime O-0535, 
Iodide of sodium O' 0136, Sulphate, of soda, 
0‘0l5I, Carbonate of soda 0-2733, Chloride 
of sodium 2- 1034, Total 2-4924. 
St. Genis is situated in Piedmont, about 4 
leagues to the East of I'urin. 'I'he tempera- 
ture of the water is 5° R. (4i l°iF.) {Me- 
morie della Reale Accademia, delle 
Scienze di Torino, xxxvi. 19.) Records of 
Science 1835. 
ON DYSLUTfE. 
By Thomas Thomson, M, D., F. R. S., &c. 
Regieus Professor of Chemistry in the Univer' 
sity of Glasgoiv. 
The mineral of which I mean to give an 
account in this paper, was sent to me at least 
seven years ago, by Ur. Torrey of New 
York; and some years after, I received a 
fresh supply from Mr. Nuthall. Dr. Torrey 
informed me in his letter, that it had been 
discovered by two American Mineralogists, 
(I think they were Mr Keating and Mr. 
Vanuxem ; though of this I am not quite 
+ Memoirs. 313. 
I Journ. de Pharm. xix. 49*2- 
