52 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



fall of rain was rather in excess of the average in most districts, although 

 at many places on the eastern littoral it still came to less than an inch. 

 The amount of bright sunshine was small even for December, the largest 

 records being only about 20 per cent, of the possible amount, and at 

 Wisley only 14 per cent. 



Observations made at Wisley : 



39°-9 



54°-3 on the 13th 



At 1 ft. 

 deep. 



42°-8 



47°-2 



35°-9 



7°-5 

 0°-0 



At 2 ft. 

 deep. 



45°-3 



48°-2 



40°-2 



, 30th 

 , 30th 



At 4 ft. 

 deep. 



47°-5 



49°*1 

 440.3 



Mean temperature of the air in shade 

 Highest „ „ „ 



Lowest ,, „ „ 



Lowest „ on the grass 



Mean temperature of the soil at 9 a.m. 

 Highest „ „ „ .... 



Lowest ,, „ ,, .... 



Mean relative humidity of the air at 9 a.m 



represented by 100) 



Rain fell on 17 days to the total depth of 



(Equivalent to about 10| gallons of water to the square yard.) 



Heaviest fall on any day 0'36 in. on the 14th and 29th 



The prevailing winds were southerly and easterly. 

 The average velocity of the wind was 6 miles an hour. 



There were only 33 hours of bright sunshine, equal to 14 per cent, of the greatest 

 possible amount. There were 18 days on which no sunshine was recorded. 



(complete saturation being 



94% 



2-23 in. 



