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,”