Mineralogy and Geology. 277 
shaken or gently heated. It was evidently a very strong brine, for it tasted 
intensely of common salt, and left on every place on which a drop evapo- 
of it for a few hours in a warm laboratory in an open dish large cubical 
crystals, exhibiting the peculiar step-like cavernous structure of common 
salt, separated in abundance. 
Its specific gravity was 1:18812, and on evaporation it gave a total 
quantity of solid residue amounting to 21856°5 grains in the gallon. 
In the imperial gallon (of 70,000 grains) there were present 10470:439 
grains of chlorine, corresponding to 1725427 grains of common salt; 
@ remainder of the saline matter, amounting to 4602-23 grains, con- 
sisted chiefly of alkaline carbonates, but also contained small quantities 
of the sulphates and carbonates of lime and magnesia; the smallnes of 
the quantity of water in my possession prevented the possibility of deter- 
mining their actual amount. 
To indicate the position of the Lake of Ooroomiah among natural 
brines, I append a table showing the specific gravities, total quantities of 
solid residue, and of common salt, in the gallon of several of the mineral 
springs of Harrogate (analysed by my friend Mr. Northcote and my: 
: | Total cn eS 
Specific residue injsalt in t eB ‘ 
Name of water. gravity. the gallon,| gallon | Authority. 
in grains, jin grains. 
Seas 
The Mediterranean....} .... 2870 
do. 
.... | Pfaff, 1889.* 
wee. | 2851 | 1905 Laurens, 18304 — 
‘ . el 
do. aoe tat oe alc aT 7 cama 
English Channel......) .... | 2660 |.... |Pfaff. 
do. .--. | 2468 | 1890 (Schweitzer, 1839.t 
German Ocean at the : 
Frith of Forth....¢| corr | 2174 | ..-+ [Platt 
Malia Bim ot. Kick inden ot pgp obits icc ak 
Holstein ........ , : 
Atlantic. ....., a ekee a 1:027 ..-. | «-- |A. H. and R. Schlagintweit. 
BOL Oee 8S FON Fe PS do. 
Harrogate Springs ‘ : 
1. Old Sulphur well...!1:01113} 1096 866 |Hofmann, 1854§ 
2, Montpelier strong ) |, ao. 
malphar well. t 101045] 966 | 803 
: pt re ell. ¢{100516] 487 | 369 do. 
me ueetads 2a V211 | 17220 | .... |Marcet.| 
| Droitwitch brine... .. 11893 | 20157 |19392 |A. B. Northcote, 1855.4] 
Stoke brine ........./1-2044 | 22256 [21492 a | 
Lake of Ooroomiah _.../1:11812' 21856 |17254 'H. M. Witt, 1856. 
* Pfaff, Schwartze’s Allgemeine und specielle Heilquellenlehre. Leipsic, 1839. 
} Laurens and Schweitzer, Phil. Mag, [3], vol. xv, p. 51. leg 
+ Phil. Mag. for 1855, vol. ix, p. 396, “On the Temperature and Density of the 
Seas between Southampton and Bombay.” : 
Hofmann, Quart. Journ. of Chem. Soc, vol. vii, p. 161. 
Marcet, Nicholson’s Journal, vol. xx, p. 25. 
Northcote, Phil. Mag. Jan. 1855. 
