PROFESSOR FORBES ON THE TEMPERATURE OF THE EARTH. 205 
TABLE VI. SHEWING THE RATE OF INCREASE OF TEMPERATURE WITH DEPTH. 

Experimental 
Observatory. anaes. 
Craigleith. 


From 3 to 6 feet, | +037 | +029 | + 0-04 
... 8to0 12 + + 0:87 + 0:63 + 0:04 
++ 38 to 24 +. + 0°38 + 0:96 + 0:19 


To complete the comparison of Meteorological data, I subjoin Mr Apte’s ob- 
servations on the mean temperature of the air and the quantity of rain fallen dur- 
ing the same period, at Canaan Cottage, near Edinburgh, 240 feet above the sea, 
excepting the months previous to May 1838, which were observed on the Regent 
Terrace, Calton Hill, at about the same elevation above the sea. 
TaBLE VII. M&AN TEMPERATURE AND QUANTITY OF RAIN FOR THE YEARS 1837-38-39- 
40-41-42, OBSERVED AT EDINBURGH BY MR ADIn. 
1837. 1838. 
Thermome- Thermome- Thermome- 
Rain. Gon. Her Rain. 
January 36 33 | 1:23 || January 31:73 January 33°05 | 1°76 
February 37°23 2:14 || February 30°06 : February 38°53 1°45 
March 35°24 1:28 || March 38:12 5 March 36:98 147 
April 39°65 | 1:61 || April -| 40-25 ° April 42°53 | 0°33 
May 48°37 1:53 || May 44°87 : May 46 82 0°47 
June 57°30 2°86 || June 53 98 June 53°42 3°91 
July 60°42 | 4:54 || July 58:94 July 57°77 | 351 
August 51°77 4-13 || August 56°88 . August 55°51 e7/7/ 
September | 53:18 | 1°73 || September | 5204 : September | 52:13 | 309 
October 50°17 2.02 || October 46 27 : October 46°50 2:38 
November 40°45 2.03 || November 38°38 - November 43:13 1°65 
December 42°68 1:67 || December 3817 : December 37°46 1:66 

Sums 552°79 \ 26°77 529-69 ; 543°83 | 23°45 
Mean 46:07 44°14 45°32 









1840. 1841. 1842, 


Thermome- Thermome- Thermome- 
ter. ter. 
January 38°74 January 33°00 January 35°45 
February 36°55 : February 38°39 : February 39°55 
March 42°74 ‘43 || March 45°62 : March 42-04 
April 48°16 ' April 44:26 : April 45°03 
May 47-13 May 51°74 May 5-22 
June 52°53 June 52°43 June 57:53 
July 52°75 : July 53°58 : July 
August 44°51 ; August 53°88 : August 
September | 48°57 : September 54°36 : September 
October 44°32 : October 43°48 ‘53 || October 
November 48°66 ; November 39°10 ‘ November 
December 87°31 December 39°65 December 


Sums 541:97 ; 549°53 “ 270°82 8-13 
Mean 45°16 45°79 45°14 
VOL. XVI. PART II. 3F 









