further north in the same district, a kind of blueish stone[7] is used for building the tunnels or chimneys, which is considered as more compact and better able to resist heat than Lapis molaris or Pipsten (Cos molaris?). The limestone placed between the other stones was procured from the sea shore, and abounded with petrified corals.
Granite, I believe of all the different kinds existing in the world, abounds every where in the forests.
In every river a wheel is placed, contrived to lift up a hammer for the purpose of bruising flax.
When it is not wanted, a trap door is raised, to turn the stream aside.
Several butterflies were to be seen in the forest, as the common black, and the large black and white. Here I noticed Lichenoides terrestre scutatum albicans, (Lichen arcticus), which has larger fructification than the common L. caninus, with which it agrees in other respects, except colour. (See Linnæus's opinion respecting this Lichen, in which however he is certainly mistaken, in Fl. Lapponica n. 442.)
By the road side between Nieutænger and Bringstad, a violet-coloured clay, used in building bridges, is here and there to be met with.
On a wall at Iggsund I found a nondescript hemipterous insect. (What this was cannot now be ascertained.)
Between the post-house of Iggsund and Hudwiksvall the abovementioned violet-coloured clay is found in abundance, forming a regular stratum. I observed it like
wise in a hill near the water which was nine ells in height.