FLORA. 275 



from Ferro. And the isotherms for the years 1873-1875 

 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 sibirica 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 lalsamea Mill.) flourishes up 

 to 61 53'. 



The silver fir (Abies 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 vitse (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 

 (Carayana arborescens L.), and the Tartarian honeysuckle 



