any fragments of the enclosing rock which may have become ine q 
‘bedded in a sen it is Pa be inferred that they were mechan ‘sj 4 
138 Scientific Intelligence. 
traversed by currents of hot water, although it still gives off steam t 
and carbonic acid at various points thro ughout its extent. At its 
northern extremity a central fissure still remains open ; 
age it is, for the most part, obs ed by siliceous conete- 
tion 
truct 
iliceous rock is metalliferous, and, in addition to oxyd — 
of iron and suites Sy contains iron and copper pyrites. M. Law 
states ss he also discovered metallic gold in this deposit. 
The rock enclosing the veins of Steamboat springs is granite, — 
which in ceeanesd vicinity is 3 much decomposed, being often sak: to 
a cavernous skeleton of silica containing a few scales of mi 
Alkaline Lakes.—In that portion of California lying es the 
east of the Sierra Nevada are Mono Lake and Owen’s Lake, both 
Sooridesstle Sheets of water, highly iencennnida with alkaline 
salts. Owen’s Lake lies in lat. 36° 20” south, long. 118° west 
men aa 8 and is about twenty miles in length and ‘7 in fF 
width. 
e incrustations, which at certain seasons of the year are found — 
to the extent of many hundreds of tons, consist of a white spo 
scence, and are, as will be seen from the results of the au : 
ysis given in the paper, chiefly composed of carbonate of soda, — 
mixed with a little chlorid of sodium and sulphate of soda =F 
General deductions,—The author remarks that, in the preset | 
state of our knowledge, the results of a careful examination of 
the gold-regions of the Pacific coast would appear to lead to the 
Scie ——— — 
uartz veins have generally been :prodneed by the slow de — 
that a subsequen deposition of quart 
betwee aye and t er ee hich they ra see ie 
In this way se introduced the masses of roc wn as 
“horses ” 
e. The formation Equsta. veins is due to hydrothermal age 
ied which | ES Tet till to be found a the hot yer" 
and recen ecent metalliferous y sat i met with in various parts 0 
ac coast, 
d. From the variable temperatures at which the vacnities it 
their fluid-cavities become ~~ it may be inferred that they a 
the result of an intermitte t action, and that the fissures 
| es traversed by arcane of hot water, whilst at othe® 
they gave meer aqueous vapor or gaseous exhalations. This is pr 
