vet FORESTRY OF NORWAY. 
snow field, of Svartis, between Ranen and Salten, plays 
also there an important part in producing like results. 
Further to the north the temperature is so low that the 
quantity of rain falling there can never equal that of 
Southern Norway; nevertheless, the condensation of 
vapour occurring there with great frequency, the number 
of rainy days is considerable. On the coasts from the 
Romsdal to the Skudesnaes, and at Christiansand, the 
annual rainfall measures about a metre or 40 inches, while 
at Tromso and at Christiania it is only about a half of 
that; and on the mountains of the Dovrefjeld it is only 
about a third of that quantity. 
When studied in connection with forestry, the distribu- 
tion of the rainfall, both in time and in space, demands 
attention. Ina volume entitled Forests and Moisture ; or, 
Effects of Forests on Humidity of Climate,* I have shown 
that while the geographical distribution of the rainfall has 
to some extent determined the distribution of forests, one 
effect of forests, when created, has been to affect the local 
distribution of rain in time and quantity, and in space. In 
a well-wooded land the rainfall may be found to be diffused 
in showers over a great part of the year; while in a land 
otherwise under similar conditions, but devoid of forests 
and other vegetation, the rain falls only at distant inter- 
vals—months or years apart—and falls in torrents. And 
again, in. the former case, the rainfall may be generally 
diffused over the whole area of the district ; in the latter 
it may fall in torrents here and torrents there, leaving 
extensive regions unvisited by rain for long. Numerous 
* Forests and Moisture ; or, Effects of Forests on Humidity of Climate.—In which 
are given details of phenomena of vegetation on which the meteorological effects of 
forests affecting the humidity of climate depend,—of the effects of forests on the humi- 
dity of the Srnpepaeees on the humidity of the ground, on hes, on the moi ‘eof 
a wide expanse of country, on the local rainfall, and on rivers,—and of the correspond- 
ence between the distribution of the rainfall and of forests,—the measure of corres: 
pondence between the distribution of the rainfall and that of forests,—the distribution 
of the rainfall dependent on a er renee determined by the contour of a 
country,—the distribution of forests affected by the distribution of the rainfall,—and 
the local effects of forests on the distribution of the rainfall within the forest district. 
Edinburgh : Oliver & Boyd. London: Simpkin, Marshall, & Co. 
