358 Buysman—Sea and Continental Climates 
climates, such enormous trees are nowhere to be found. It is 
a peculiarity of the Pacific coast vegetation, the cause of which 
In the southern parts of the Amur region in Asia, there is in 
summer a luxuriant vegetation; the annual precipitation 
er. 
the interior of Siberia the vegetation consists chiefly of 
coniferous trees; thus the luxurious growth in the region just 
named must be caused by the influence of the sea climate, as 
Middendorf suggests,” though there is a mountain chain on the 
east coast. 
The extensive forests of Russia and Siberia prove that an 
extreme continental climate is resisted by some coniferous and 
other trees; but it is evident that in general a sea climate with 
mild winters, and thus a long period of vegetation, suits them 
best.” 
latitude, and precipitation takes place only in summ 
n 
As we have seen, the northern limit of the cultivation o! 
corn reaches to a much higher latitude over the continent than 
near the seashore. On the northwest coast of North America 
the Island of Sitka (57° N. L.) and Radjah are on the extreme 
limit. On the Faroe Islands barley is cultivated, but corp 
seldom ripens;* the cause is absence of sunlight on account 
of the continual cloudy sky, storms and precipitation causing 
low temperature in summer (mean temperature at Thorshaven 
in July, 55°); for corn wants a sunny climate and the direct 
influence of the sun’s rays. This explains why it can be cul- 
tivated within the polar circle (Norway) where the sun in the 
summer season remains constantly above the horizon. 
In North America, on the shores of Hudson’s Bay, the tree 
limit goes down to 59°, the corn limit to 50° (Ontario). On 
the shores of the Ochotsk Sea corn cannot be cultivated at all, 
even on the south coast under 50°. In Greenland also the cu! 
tivation of corn is impossible. The causes are the same as 
stated above—the sea winds, wet climate and fog in summer; 
that is, want of sunlight. 
Of all cultivated vegetables Raphanus sativus L. et val 
(Radish), Brassica Rapa L.set var. (Turnip) and Brassica Napus 
18 Kittlitz. Vierundzwanzig Vegetationsansichten von Kiistenlandern und Inseln 
des Stillen Ozeans, p. 53. 
14 Middendorff, p. 763. 
i5 The stems of all the Siberian trees are slender compared with those of Hurope 
even when they are centuries old. Middendorff, p. 632. 
16 Martins, Sur la vegetation de l’Archinel des Féroé. 
iy ville es aa 
