j On the Cypress Timber of Mississippi and Louisiana. "y 
lowest depression up to the most elevated, being equivalent to a 
ie rise and fall in the Mississippi river extending through a series of 
a forty-five feet. This is known to be its maximum, at least in 
the middle of the cypress growing region. However slow the 
process of filling up these lakes or basins, ancient beds of the 
river or other depressions, with sedimentary matter, yet being 
progressive, their bottom must finally become elevated to the 
level of the outlets; and when this is the case, cypress timber 
takes almost exclusive possession of the whole depression, and 
. contributes, by its own depositions, to accelerate the process of 
' me elevation. ‘Through an accumulation of imperfectly decomposed 
five feet below ; measuring out a time when not less than ten 
owths must have succeeded each other, 
to 
the depressed bottoms become elevated by their deposit, but nev- 
er permits the superstratum of vegetable matter to exceed a few 
feet in thickness, before it blends into, aud assumes t é city, 
of the understratum. Hence all the stumps inferior in position 
table products ; and in proof of this, after an unusually dry sea- 
“ontact with water, and leaving little t , 
_An inspection of these morasses at any time will satisfy an 
ver, that they are composed almost exclusively of vegetable 
cts of every ki ‘ or washed in from 
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