iO& FORESTRY OF 



matters, be not furnished to it. Witness the Great Sahara 

 and the Sahara of the South.' 



In view of such observations as these made elsewhere, 

 the student of forest science, in studying phenomena pre- 

 senting themselves for consideration in Norway, may be 

 disposed to give his attention for a little to the geology of 

 the country, and to the distribution of trees in relation to 

 this. For the following sketches of both, I am indebted 

 to the report by Dr Broch. It is only because of the free- 

 ness with which I happen to have abbreviated and trans- 

 lated his statement that I do not mark it as translation. 



The fundamental rock which consist of gneiss in primi- 

 tive schists mica schist, talc schist, pot stone, quartzose 

 schist, quartzite, &c., appears on the coast of the Miosen 

 lake and of the Christiania fiord, from Elveram to the 

 south of the plateau of the Oplande, and in continuation 

 to the south. It is traversed by small eruptive masses of 

 old granites, partly in chains, partly in masses, which in 

 the Solor and the Odal take all the direction from N.N.W. 

 to S.S.E. The frontier region of the Odal, the Finskog, 

 and the wooded ridges of the Vinger, consist of eruptions 

 of this kind, and . especially of striated granite. These 

 eruptions form wooded ridges of little elevation, and often 

 also of little breadth. Elsewhere they are met with in 

 various districts, and are generally wooded. They are 

 often accompanied by gabbro, consisting of hyperstene, 

 labradorite, and nerite; and metallic ores or metallic 

 veins and deposits are not a wanting. 



Elsewhere there are met with masses of granite of later 

 eruption seen in islands lying outside of the Drontheim 

 fiord, and elsewhere. And in some adjacent islands may 

 be seen the fundamental rock covered with an envelope 

 of sandstone grit and conglomerate. 



'The granites, which cover an area of 23,000 square 

 kilometres, inclose, especially in the depth of valleys, 

 parts more or less distinctly marked, kinds of islands 

 where the fundamental rock makes its appearance. Aud 



