234 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



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



represented by 100) ... ... ... ... ... ... ... ... 68% 



Rain fell on 10 days to the total depth of 0-52 in. 



(Equivalent to about 2^ gallons of water per square yard.) 



Heaviest fall on any day 0-15 in. on the 18th 



The prevailing winds were westerly, from south-west to north-west. 

 The average velocity of the wind was 4f miles per hour. 



There were 255-8 hours of bright sunshine, equal to 52 per cent, of the greatest 

 possible amount. There were no days on which sunshine was not recorded. 



August. — The weather of this month differed considerably in different 

 parts of the kingdom. In the western and northern districts it was 

 unsettled, and there was more than an average fall of rain ; but over the 

 Midlands and the eastern and southern counties it continued fine through- 

 out, with a small rainfall, high temperature, and abundant sunshine. In 

 several districts there were thunderstorms, accompanied in many instances 

 by heavy falls of rain, and in some cases hail. One of the latter, which 

 occurred at the beginning of the month, was exceptionally destructive to 

 crops and to gardens in the eastern Midland districts. At the close of 

 the month some unusually high temperatures were experienced over a 

 considerable portion of the kingdom. 



Observations at Wisley : 



Mean temperature of the air in shade 64°-3 



Highest „ „ „ 91°-1 on the 31st 



Lowest „ „ „ 40°-7 „ 29th 



Lowest „ on the grass 34°-0 „ 29th 



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



deep. deep. deep. 



Mean temperature of the soil at 9 a.m 64°-5 64°-5 61°-8 



Highest „ „ „ 67°-8 66°-3 62°-3 



Lowest „ „ ., 60°-7 62°-4 61°-1 



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



represented by 100) 70% 



Rain fell on 9 days to the total depth of 1-06 in. 



(Equivalent to about 5 gallons of water per square yard.) 



Beaviest fall on any day 0*43 in. on the 2nd 



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

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



There were 237'2 hours of bright sunshine, equal to 53 per cent, of the greatest 

 possible amount. There were no days on which sunshine was not recorded. 



September. — The remarkable warmth with which the preceding month 

 closed continued during the earlier days of September, and some very 

 high readings of the thermometer in the shade were recorded in many 

 places, together with equally remarkable readings of the solar radiation 

 thermometer. This very hot spell did not last long, however, although 

 the weather still continued warm during nearly the whole of the month, 

 with less than the average fall of rain, and with a remarkable excess of 

 bright sunshine. In many localities no rain at all fell throughout the 

 latter half of the month. 



Observations made at Wisley : 



Mean temperature of the air in shade 57°-9 



Highest „ „ „ 92°-2 on the 1st & 2nd 



Lowest „ „ „ 33°-2 „ 26th 



Lowest „ on the grass 26°-8 „ 25th 



