1S14.] and on J'egetation. 25 



51 



„., . , , .„ C 17 September 44-24° 



At Eric s spring, by the mill. \ 4 0( f tober 44 . 06 



I" l809 ' 1* Ditto 44-06 



Priest's well, by Haga. In £ 16 September 44*24 



1S09 £10 October 44-06 



As tbese observations were made during a year, the mean tempe- 

 rature of which differed considerably from that of the springs ; the 

 heat of these springs seems to be constant ; and the agreement of 

 their temperature with each other cannot be considered as acci- 

 dental. 



At the south end of the lake Yngen, in the parish of Kroppa, by 

 the town of Philipstadt, almost under the same latitude as Upsala, 

 but more elevated above the level of the sea, I found in the year 

 1609 the heat of 



r o July 40-S2° 



The spring of Rilbhogdloitn, \ 1Q m ^ Q 41<18 



near little AngtjSrn £ g August 44 . 42 



The spring at Nykroppahog- f 5 July 42-62 



den, on the south-east of the ) 9 Ditto 4 1 -00 



great furnace (_ 6 August 42*80 



These last springs havG diminished so much of late, that no motion 

 whatever can be perceived in their bottom. It is obvious that the 

 drought, which has diminished these springs, must have somewhat 

 increased their temperature. 



The Ohs spring (Ohskalla), somewhat less than an English mile 

 north from Herhult, and near a small lake called Get Plohgan, on 

 the west side of the river Hult, in Yermeland, is a strong spring, 

 which rises from a sandy bottom about a fathom deep. Its tempe- 

 rature was, in 1S09 — 



00 



25 July 41-18° 



6 August 41-00 



7 Ditto 41-00 



21 September 41-00 



The last observation was made after my departure by Gustavus 

 Wahlenberg, with a thermometer graduated like mine. The tem- 

 turc of this spring, which was determined during a year in 

 which the heat of more scanty springs was variable, may be consi- 

 dered as constant. Hence I believe that we may, without sensible 

 error, reckon the temperature of the earth at the lake Yngen as 41°. 

 Were \\e acquainted with the rate at which the temperature of 

 small and large springs varies, a few slight observations on the 

 temperature of such springs would make us acquainted with that of 

 tiic earth. Experiment has shown us that April and October com- 



