HELSINGLAND. 31 



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 

 JLichenoides terrestre scutatum albicans.) 

 (^Lichen ai^cticus), which has larger fructi- 

 fication than the common L. caninus, with 

 which it agrees in other respects, except 

 colour. (See Linnaeus's opinion respecting 

 this Lichen, in which however he is cer- 

 tainly mistaken, in Fl. Lapponica n. 442.) 



By the road side between Nieutsenger 

 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 nonde- 

 script 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, form- 

 ing a regular stratum. I observed it like- 



