FLORA. 275 
from Ferro, And the isotherms for the years 1878-1875 
are indicated from 5° to zero. 
Section B.—Exotic TREES AND SHRUBS. 
Besides trees indigenous in Finland, there are cultivated 
several which have been introduced from abroad. Amongst 
these is the Siberian fir, or pitch pine, Abies stbirica Led., 
Pinus pikhta, Fisch. Planted in some parks in the southern 
part of the country, this tree has exhibited so favourable 
a growth as to lead to its being considered deserving of 
cultivation in the forests ; and some experiments of this on 
a small scale have been made at Evois. 
The Siberian Cembrian pine (Pinus cembra sibirica). has 
been of late years cultivated here and there up to 67° in 
the valley of the river Tornea. 
The Weymouth pine (Pinus strobus L.) grows well up 
to 63°, near the west coast at Wasa, but it does not appear 
to succeed in the interior of the country to a higher lati- 
tude than the vicinage of 61°. 
The Balm of Gilead (Abies balsamea Mill.) flourishes up 
to 61° 53’. , 
The silver fir (Abzes pectinata D.C.) suffers even on the 
south coast as at Helsingfors, where it attains but little 
height, or more properly it may be said it becomes stunted 
in its growth. 
The white fir (Abies alba Michx.) thrives in the vicin- 
age of 60°. 
The American arbor vite (Thuja occidentalis L.). is 
found on the western coast as far as 63°, but in the 
interior of the country not beyond 61°. It is but little 
cultivated. But on the west: coast, where the limits. of 
vegetables towards the north reach in general to a higher 
latitude than in the interior of the country, it has-been 
cultivated successfully so far north as Tornea 65° 51’. 
' The lilac (Syringa. vulgaris L.), the Siberian pea-tree 
(Caragana arborescens L.), and the Tartarian honeysuckle 
