64 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



The results from Wisley are as follows : 



Mean temperature of the air in shade 44°'7 



Highest „ „ „ 53°-4 on the 17th 



Lowest „ „ „ 29°-l „ 8th 



Lowest „ on the grass ... 17°-2 „ 8th 



Number of nights of ground frost 14 



At 1 ft. At 2 ft. At 4 ft 

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 42°-9 43°-3 46°-2 



Highest „ „ „ ... 46°-5 45°-l 47°-0 



Lowest „ „ „ 39°'0 41°-5 45°-6 



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



represented by 100) 91 % 



Rain fell on 25 days to the total depth of ... 6*21 in. 



(Equivalent to about 29 gallons of water to the square yard.) 



Heaviest fall on any day 0*72 in. on the 10th 



The prevailing winds were from south-east, south, and south-west. 

 The average velocity of the wind was 9 miles an hour. 



There were 46 hours of bright sunshine, equal to 19 per cent, of the greatest 



possible amount. 

 There were 12 days on which no sunshine was recorded. 



