104 On the Heat of Springs, [Aug. 



Half a Swedish mile south from the towp, the alnus incana 

 grows in abundance ; but in the whole of Gestrikeland this tree 

 occurs much more rarely than the alnus gtutinpsa. Hence its limit 

 may, without impropriety, he placed !>cre. 'I be rubu s chameepiorus 

 and scirpi/s ceespilosus likewise have their limit here. The southern 

 plants which do not vegetate farther north than the latitude of 

 Geffle are the following :— ^piro>a fiUpendula, saxijraga qranulata, 

 Qgrimr,n : a eupatoria, irifolivm montanum, malva rotundijoUa, gera- 

 nium rotundifoinm and cicutarium. 



In the parish of Hille, one eighth of a Swedish mile north-east 

 from Trodjf. the temperature of the spring called Kallkall-Back 

 was, on the 20th June, 41 '72° ; on the 22d August, 43 52°. 



This rivulet is remarkable, because the cormis suectca grows in it 

 upon small hillocks of earth. This plant appears considerably laier 

 ii Helsingelund ; a proof that springs are capable of promoting the 

 growth of such northern plants as are not quite suited to the 

 cjimate. A strong mineral spring at Hamrtmg had the following 

 temperatures: — On the 20lh June, 401°j on the 22d August, 

 4208®. 



These temperatures appear low. 



Gestrikeiand at its northern limit (in lat. 6l c ) is exactly similar 

 in point of vegetation to the country round the lake Yngen, in 

 Vermeland (in lat. 595°, and 549 English feet above the level of 

 the sea). Beiula nana and carex globularis are quite common; the 

 first of which, in the neighbourhood of Trodjp, is only to be seen 

 growing sparingly in morasses. The following plants find their 

 northern limit at this place : — Primula veris, corylus avellana, 

 viburnum opulu*, ly thrum salicaria. The alum incana still retains 

 its superiority over the alnus glutino^a. 



Riibus arcticus appears upon our first entrance into Helsin?eland, 

 and, with other northern plants, becomes very common about 

 Shoo, which may be considered a= the most elevated pait of the 

 province. Alter much trouble, I found here the spring called 

 Storswedjekalla, on the left hand side of the way to Gohlgrube, 

 and one fourth of a Swedish mile from Stro'tjiirn. Jt was a strong 

 spring, and its temperature was, on the 22d August, 40* Ui°. 



This may very well pass for the temperature of the earth in so 

 h.'gh a situation. 



Huddikswall-, lat. 61 '75 . 



At Enanger we again reach the sea, and at that place, notwith- 

 standing its more northerly position, we find nearly the same 

 climate as about Skog. The temperature of SuvikskiUla, a spring 

 one fourth of a Swedish mile north from Enanger, was as follows: 

 On the 23d June, 39-92° ; on the 20th Angust, 42-08°. 



At i una, a little above Huddihu nil, the cornus suectca hecomes 

 quite general, and the alnus gtutinosa not only appears seldomer 

 than the alnus incana, but is now quite rare, even upon the sea 



