806 JOUENAL OF THE EOYAL HORTICULTUKAL SOCIETY. 



November. — Very cold and exceptionally dry. The days were, as a^. 

 rule, about 3 degrees colder, and the nights about 3 degrees colder, thani 

 is seasonable. On the coldest night the thermometer on the grase. 

 showed 20 degrees of frost. 



The rainfall was exceptionally light, being less than a quarter ot 

 the average quantity for the month. 



Mean temperature of the air in shade ... ... ... ... 40°.4 



Highest „ „ . „ 54°.4 on the lltb 



Lowest „ „ 21°.l Kith 



Lowest „ on the grass 11°. 5 ,, KHh 



At 1 ft. At 2 ft. At 4 ft. 

 •leep. fleep. deep. 



Mean temperature of the soil at U a.m. ... 42^.2 46°.4 50?.0 



Highest 47°.3 50°.8 52°.7 



Lowest 37°.2 42°.l) 47° 3 



Mean relative humidity of the air at 1) a.m. (complete saturation being 



represented by 100) ... ... ... ... ... ... ... ... 84 



Rain fell on only 4 days, to the total depth of ... ... ... ... O-ol in^ 



(Equivalent to about 2 gallons on each square yard of surface in the Gardens.) 

 Heaviest fall on any day ... ... ... ... -. ... 0 27 in. on the 1 



December. — Seasonable in temperature and exceptionally wet. The 

 days were, as a rule, about 1 degree warmer than is seasonable, while 

 the nights were of about average temperature. On the coldest night the 

 thermometer on the grass showed 13 degrees of frost. 



The rainfall was exceptionally heavy, being more than double the 

 average quantity for the month. 



Mean temperature of the air in shade ... ... ... ... 38^.9 



Highest „ „ „ 55^.9 on the 30th 



Lowest „ „ „ 23°.3 „ 17t 



Lowest ,, on the grass ... ... ... ... ... 18°.6 „ 19th 



At 1 ft. At 2 ft. At 4 ft. 

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 38°.9 42°.l 45°.9^ 



Highest „ „ „ 4o°.l 45°.3 47°.2 



Lowest „ „ „ 35°.4 39°.3 43°.7 



Mean relative humidity of the air at 9 a.m. (complete saturation being 



represented by 100) 87 



Eain fell on 15 days to the total depth of ... ... ... ... 3*38 in. 



(Equivalent to about 1(5 gallons on each square yard of surface in the Gardens.) 

 Heaviest fall on any day ... ... 0*77 in. on the 12th 



The Diagrams. — The averages with which the diflerent mean monthly 

 temperatures are compared in diagrams 1 and 2 are derived from the- 

 observations taken at Kew Observatory during the twenty-five years 

 ending 1895. The actual averages for Kew have not been used, but the 

 departures in mean temperature, &c., from the monthly means for 1901 

 at that Observatory have been applied to the Chi s wick temperatures ; and 

 in this way very close approximations to the true monthly averages have 

 been obtained. Mr. Glaisher's discussion of the Chiswick temperatures,. 

 1826-69 (referred to in Vol. xxiii. page 391), was not available for this 

 purpose, as it gives no maxima or minima temperatures. The rainfall 

 averages used in diagram 1 are, however, those given by Mr. Glaisher for 

 the forty-four years ending 1869 at Chiswick. 



