428 MR. G. V. VERNON ON THE 



have occurred early in the year, the November previous 

 has had a mean temperature below the average. 



November 1784 had a temperature i°*7 below the aver- 

 age^ succeeded by December 7°* 8 below^ January o°-4 above, 

 February 7°-8 below, and March 7°*o below the average. 

 The great frost, which set in fiercely upon the 6th January 

 1 8 14, was likewise preceded by a November 2°'2 below 

 the average, December 2°"2 below the average* January 

 was 8''-8 below, February 4"* 2 below, and March 5°-8 

 below the average. 



The cold period in January and February 1838 was also 

 preceded by a November i°'3 below the average, and De- 

 cember 2°'4 above the average; January 1838 was 6°'8 

 below, and February 5°' 3 below the average temperature. 



Careful investigation of the mean monthly temperatures 

 for the long period made use of shows that no safe con- 

 clusions of any kind can be based upon the character of 

 any particular month. 



In conclusion, I may state that cold winters succeeding 

 a warm November were very few in number, and in most 

 cases these winters were preceded ])y a November not much 

 above the average temperature, as in 1783, 1794, and 

 1799, when the mean temperature of November was only 

 o°*5, o°'9, and o°*5 respectively above the mean. 



November 1822 and 1846 were the only two Novembers 

 much above the average w^hich were followed by a cold 

 period immediately afterwards. 



