92 



VITAL ACTIONS. 



rature indicated by springs will be too high in winter 

 and too low in summer ; a most material error. 



116. From the observations of Mr. Ferguson, of 

 Eaith, with thermometers buried at different depths 

 in the ground, it appears, that in the years 1816 and 

 1817, at that place, in 56° 10' N. lat., and 50 feet 

 above the sea, the mean temperatures, indicated by 

 geothermometers buried respectively to the depths of 

 one foot and two feet, varied from 19° to 21° Fahr. 

 between summer and winter, the earth being colder 

 in winter and hotter in summer to that amount ; and 

 the highest mean observed was 55'2°, in July, 1817, 

 at a foot below the surface.* Other observations, of 



temperature of a spring at Raith, iS'Y"; but the mean tempe- 

 rature of the earth, one foot below the surface, was 43"58°, and 

 two feet, 44-55°. 



* Observations made on the Temperature of the Earth, at one and 

 two feet below the Surface, in the Garden of Robert Ferguson, Esq, of 

 Raith : — ■ 



January . . 



February . . 



March . . . 

 April ... 



May . . . , 



June . . . 



July . . . 



August . . 



September . 



October . . 



November . 



December . 



Mean of Tear 



1816. 



One 

 Foot. 



33-0° 



33-7 



35-0 



39-7 



400 



61-6 



54-0 



50-0 



61-6 



47-0 



40-8 



35-7 



Two 

 Feet. 



36-3' 

 36-0 

 36-7 

 38-4 

 43-3 

 500 

 62-5 

 52-5 

 51-3 

 49-3 

 43-8 

 40-0 



1817. 



One 

 Foot. 



35.6° 



37-0 



39-4 



45-0 



46-8 



511 



65-2 



53-4 



53-0 



46-7 



41-0 



35-9 



Two 

 Feet. 



38-7 

 40-0 

 40-2 

 42-4 

 44-7 

 49-4 

 55-0 

 53-9 

 52-7 

 49-4 

 44-7 

 40-8 



43-8 44-1 44-9 46-9 



