300 J. D, Dana on the Origin of Prairies. 
ash and arbor-vite, which have their trunks enue to the depth of 
two or three feet are invariably killed after some t 
1 have met with but two cases of lakes ean drained. In one of ‘ 
these, a heavy crop of grass was produced the first year, chietiy 6 fe Ses blue: 
Ce 
In the other case, coarse grass, sedges and other herbaceous plants pre- 
vailed for a year or two but very soon gave place to a rank growth of ‘ 
maple, &c.—the alder and willow growing most rapidly. I have no 
reason for supposing that the trees did not vegetate the first year; they 
became conspicuous as they grew higher than the grass and other herba- 
geous plan 
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pools and in wet depressions there are Shean oO pats and co 
grasses ; but a clumps o ned larch and other trees occur scattered 
“you n draw whatever conclusion you may think — 
it silent that in our climate trees will i vA 
wettest soil and even displace grass where it has ali 
Pe, e facts described by Prof. Verrill are so fall and explicit in 
re of oe of lakes, peat-lands and swamps, pares 
times rest land, that it is unnecessary to 
= asitional shack vate ; 
sn a Seen itis important to note some of the condi- — 
tio pie to the self-propagation on a 
y ‘ecl-kaown bea a eebuetls =o — a 
