140 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



of the month it was fine and very warm, with no rain. Then the 

 v/eather became again unsettled, with cool days and a good deal of 

 rain, and this continued with very little* change till the end of the 

 month. The mean temperature for the month was about normal, 

 because the high readings of the thermometer in the first half served 

 to balance the colder days of the second half; the amount of sunshine 

 also, although low for August, was yet better than in July, as that of 

 July was an advance on the amount recorded in June. The daily 

 amounts of sunshine were, however, frequently small, and the total 

 was below the normal. 



The following are the results of the observations made at Wisley : 



Mean teniperature of the air in shade ... ... ... ... 61°.5 



Highest „ „ „ 86°.0 on the 12th 



Lowest ,, ,, ,, ... . 



44°.0 „ 3rd 



Lowest „ on the grass 



37°.0 „ 3rd 





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





deep. deep. deep. 



Mean temperature of the soil at 9 a.m 



62°.3 62°. 8 59°.7 



Highest „ „ „ ... . 



66°.5 64°.9 61°.0 



Lowest ,, „ ... . 



58°.9 60°.l 58°.l 



Mean relative humidity of the air at 9 a.m. 



(complete saturation being 



represented by 100) 



73 % 



Rain fell on 13 days to the total depth of ... 



2-16 in. 



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



Heaviest fall on any day 



0-50 in. on the 17th 



The prevailing winds were westerly. 

 The average velocity of the wind was 4| miles an hour. 



There were 226 hours of bright sunshine, equal to 51 per cent, of the greatest possible 

 amount. 



There were only 2 days on which no sunshine was recorded. 



Se'pteinher. — This was another in the sequence of dull, cold 

 months which had characterized this summer. In no part of the king- 

 dom did the thermometer rise to more than just over 70°, and in many 

 parts of Southern England 70° Was not reached at all; indeed, at 

 Wisley there were eleven days on which the maximum temperature was 

 below 60°. On the other hand, the night temperature was frequently 

 high, and, as in the preceding month, the daily range was small. 

 There was a good deal of rain, and on the 17th a severe thunderstorm 

 in the Thames Valley caused a fall of 1*4 in. of rain at Wisley. There 

 were also heavy falls of rain towards the close of the month, especially 

 over the Western Counties and in parts of Ireland. The amount of 

 bright sunshine was small everywhere, and even in the Channel Islands, 

 where it was most abundant, it did not amount to 50 per cent, of the 

 possible amount. At Wisley it only amounted to 31 per cent. 

 Northerly and north-easterly winds were predominant during the 

 greater part of the month. 



The following af e the result s of the observatrions made at Wisley : 



Mean temperature of the air in shade » ... 54°.5 



Highest „ „ „ ... 70°.0 on the 6th 



Lowest „ „ „ ... ... ST^.O „ 2nd 



Lowest ,, on the grass 30°.0 ,, lOtb 



Number of days of ground frost 3 



