. 1478. It is important, however, to at- 
tend to Mr. Farquharson’s description of 
the tract to which they refer (Alford, in 
400 to 600 feet above the sea, studded with 
manyirregular ridges and groupes of moun- 
tains, of different elevations, up to 1,800 
cultivated vegetation, not rising naturally 
much above 500 or 600 feet; as also, the 
Ed at all here. Mr. Farquharson's 
remarks being numbered 1, 2, 3, &c. the 
same course is followed below. 
1. It is stated by this gentleman, that 
Wheat has been cultivated at 600 or 650 
feet, but frequently failed to ripen, though 
bs. has intimated to me his belief 
the height is over-estimated by 200 
, Or more; and it does not appear, from 
0 Lostonét, whether it was a suc- 
experiment to sow Wheat at this 
ion. I have elsewhere (Outlines, 
REMARKS ON THE BOTANY OF BRITAIN. 
1832) expressed my conviction that the 
line of Wheat is usually much below 1,000 
feet in the Highlands, and am glad to see 
it thus confirmed by Mr. Farquharson, 
; Posskis Wheat might ripen in favourable 
situations and. seasons, even at 1,000 feet ; 
but it could hardly be a safe or economical 
speculation to a farmer. 
3. There are cultivated fields, probably 
of Bigg, above Castleton, in Braemar 
which is considered to be about 1,100 feet 
(Invercauld Castle, 1070 feet) above the 
sea; but I cannot state how much higher 
they extend—it may be 300 or 400 feet. 
The suggestion that Avena strigosa 
might succeed above 950 feet, is borne out 
by a locality given for it in the British 
Flora, namely, “ Dee-side, above Mar- 
Lodge, Aberdeenshire.” 
8. Potatoes are here stated often to fail 
in the Highland glens above 950 feet. I 
think to have seen them cultivated at 700 
feet in the north of Argyleshire, and at 1,300 
feet in Perthshire. The lines of cultivated - 
plants appear to be much more depresse 
in the former county than in Aberdeen- 
shire. 
19. Trifolium pratense and T. repens 
are said to answer well when sown at 950 
feet, and the last to be native even higher. 
Both rise much above this, as indigenous 
plants. The latter I have seen above the 
lake on Ben Lawers, which is somewhere 
stated (by Macculloch, I think, ) to be 1,000 
feet below the summit of that hill; hence, 
3,000 feet above the sea. 
20. Though not prepared to point out 
the exact line of the Oak, I am much in- 
clined to say it will run above 700 feet 
in the latitude of Aberdeenshire. Indeed, 
I find the Oak mentioned in a list of spe- 
cies observed near Castleton, in Braemar, 
' though with a suspicion of its being planted 
there. Macgillivray indicates the Oak and 
Ash to commence below Castleton. 
22. Certainly 500 feet “ cannot be con- 
sidered as the furthest limit" of Corylus 
Avellana. Probably 1,500 feet is nearer 
the tru : D 
99. The Alnus glutinosa has about the © 
E 
E 
- same limit, or may ascend a little higher. s 
