I obtained last summer, through the kindness of my venerable friend, Dr. Nils Nordenskiöld, of Helsingfors, a fine collection of Finnish focks and minerals, collected by his son, Professor Adolph Nordenskiöld, of the Academy of Science, Stockholm. Very little attention has been given in this country either to the rocks or mineral productions of this part of Northern Europe, although both are exceedingly remarkable. I propose, therefore, to introduce some of the more interesting in this article, giving at the same time a brief sketch of the general mineralogy of the land.