282 SCOTTISH GEOGRAPHICAL MAGAZINE. 



represented, which is as large as can be exhibited with clearness on the 

 scale of 80 miles to 1 inch. 



The same signs or forms of conventional lines have been retained for 

 the several species in all the maps, and they have also been adopted 

 where similar work has been done in adjacent parts of the United States. 

 Our present map covers the most important and interesting portion of 

 the great forest region of Canada. Beyond this area the northern species 

 extend to Alaska, and there are valuable forests west of the prairies, in 

 the Rocky mountains and British Columbia. But the northern group 

 embraces only nine species, and the contours of their limits are not 

 known to possess any peculiarities which cannot be described without a 

 map. On the plains, trees of any kind occur only in favoured situations, 

 and the different species are scattered in such a way that it would be 

 difficult to represent the boundaries of their distribution on a map, while 

 in British Columbia most of the trees are of different species from those 

 east of the Rocky mountains, and they would require to be shown on a 

 separate sheet. 



IN LABRADOR . 



The map of the Labrador peninsula, published in the Scottish G-eo- 

 graphical Magazine for July 1895, gives the limits of each of the forest 

 trees in that region so far as they are known up to the present time , 

 but owing to the comparatively small amount of exploration which has 

 yet been done in that peninsula, these tree-lines cannot be expected to be 

 so accurate in detail as those of the rest of our map. The official reports 

 of explorations made for the Geological Survey by the writer have 

 generally contained notes on the forest trees of each region, and these 

 have been utilised in preparing the present map. The writer is also 

 indebted for various facts to nearly all his colleagues on the Geological 

 Survey who are engaged in exploring work, and more especially to Messrs. 

 Tyrrell, Low, and Macoun. 



FOREST WEALTH OF NORTH AMERICA. 



North America possesses a forest wealth which is perhaps unequalled 

 in any other region on the globe. No fewer than 340 species of trees 

 are known to be indigenous to the United States. Of these, 123 grow 

 in Canada, 94 occurring east of the Eocky mountains, and the remaining 

 29 on the Pacific slope. Sixty-four of those east of the mountains are 

 therefore unrepresented on the map, but the greater number of them are 

 confined to small areas in southern Ontario, while those which ex- 

 tend beyond this district are apparently of less interest with regard to 

 their distribution than the thirty species which have been selected for 

 presentation. 



ACCURACY or THE TREE-LINES. 



The contours of the limiting lines of each species have been carefully 

 laid down from every source of information up to the present year, and, 

 except in the Labrador peninsula, they cannot be far from the truth. If 



