THE FORMATION OF DEPOSITS I5

When he showed that lodes were deposited from solutions
in fissures ; his followers were ** ascensionists,” as they
tributed ‘the ores to metal-bearing emanations due to

[

Fla. 7,—Earpy THEORIES OF ORE GENESIS, i
ies of ore genesis.
A-D. The development of early theories o 1753,
A. The early Ascensionist School from Bauer, 1496, Lagan il
the veing being attributed to injection from the i
earth, » ]
B. Von Trebra, 1785, the lodes being due to deposition © ato ions
Which have ‘risen from below along fissures and oi oo ampreg:
fated the adjacent rocks widening the lodes by ** tra
replacement), . . .
C. Lasgo? 1789. The ores derived by the solution of metallic paisley
by Widespread ascending water which collects into one chan
deposits the ores alon its course. .
D. Werner, I791. Lodes re mod in a fissure which ends fo ans
is filled by water from the porous beds. 1 and 2, jn: sto e and
grit, 3, limestone, from which are derived the ores an, vein
in the fissure.

“ fermentations "in the bowels of the earth (Fig. 7). Leh.-mang,
 in 1753, pointed out the upward branching of veins
and that their crystalline character indicated deposition
from hot Solutions; he attributed lodes to lapidific juice,”