CONTRIBUTIONS TOWARDS A 
..94. Pinus sylvestris I have seen to near 
2,300 feet, though quite small; and, as 
before noticed (1464), its upper line rises 
to an elevation far exceeding any of the 
hills within Mr. Farquharson’s district. 
25. Betula alba is similarly circum- 
stanced. Though uncommon above 2,000 
feet, its natural line appears to run sate 
than that of the Scotch Fir. 
. Ulmus montana will grow at twice, 
perhaps thrice, the height of 500 feet; as, 
indeed, might be conjectured from the 
statement that it * becomes here a fine 
lus tremula succeeds far above 
. the ‘valley of Alford. Mr. Trevelyan ob- 
served it at 1,500 feet in the Isle of Mull; 
‘and I estimate it to be still higher in 
Braemar. 
36. The natural line of Rubus Ideus 
exceeds that of Corylus Avellana. Perhaps 
it may attain 2,000 feet, though I cannot 
affirm that it does so. 
37. Cytisus scoparius flowers at 1,500 
or 1,600 feet, in Braemar, and grows yet 
higher, even to 1,800 or 1,900 feet. 
38. Ulex Europeus occurs in a few places 
about Castleton, at 1,200 or 1,300 feet, but 
does not appear to be indigenous there. 
In England it exceeds the line of cultiva- 
tion. 
39. The upper line of Lonicera Peri- 
D corresponds to that of the Cory- 
lus or 
With vn to Mr. Farquharson's con- 
cluding remarks, containing some valuable 
ilustrations of the influence of physical 
agents on vegetation, I must take the li- 
berty of questioning the supposition “ that 
exposure does not modify the attainable 
elevation of the herbaceous and annual 
ibes" The statement is somewhat start- 
, and assuredly conflicts with my own 
n trees and shrubs than on herbaceous 
sies. This is partly explained by the 
; circumstance, that slight inequalities of 
Surface may counterbalance, in some mea- 
Sure, the ill effect of an exposed summit 
or declrvity, so far as small me are con- 
FLORA OF SOUTH AMERICA. 
cerned, though yielding no protection to a1 
Oak or a Pine. 
near to it, for many days during viste 
and their life or death during the heats of 
sum 
ind concluding, I beg to add, that 
Mr. Farquharson's observations bear in 
themselves the.impress of accuracy, and 
are doubtless strictly applicable to the par- 
ticular district illustrated by them. 
additions and comments only go to prove 
that in other situations, more favourable to 
the ascent of plants, several of the species 
A 
PACIFIC. 
By W. J. Hooker, LL.D 
A.M.F 
. and G. A. W. pee 
R.S.E 
( Continued from p. 111. ) 
owe to the omnes of M. fee” l 
