108 ‘ FORESTRY OF NORWAY. 
matters, be not furnished to it. Witness the Great Sahara 
and the Sahara-of the South? 
In view of.such observations as these made elsewhére, 
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, aud 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,:tale schist, pot stone; quartzose 
schist, quartzite, -&c., appears on the.coast of the Miosen 
lake and of the. Christiania fiord, from Elveram to thé 
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 awanting. . 
. 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, 
arts. more or less distinctly marked, kinds of islands 
where the fundamental rock makes its appearance. . And 
