23'2 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 





45°-9 







71°'6 on the 12th 





25°-0 



„ 15th 





15°-1 



„ 15th 



At 1 ft. 



At 2 ft. 



At 4 ft. 



deep. 



dsep. 



deep. 



45°-4 



4G°-2 



45°-l 



49°-5 



430.4 



46°-5 



41°-8 



42°-2 



42°-3 



Heaviest fall on any day 0-28 in. on the 10th 



The prevailing winds were south-westerly and north-easterly. 

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



There were 111-4 hours of bright sunshine, equal to 31 per cent, of the total possible 

 amount, and there were 6 sunless days. 



April. — The weather during the month was in many respects very 

 remarkable. It was marked by an entire absence of gales of any conse- 

 quence and by a great deficiency of rainfall and an excess of sunshine. 

 The dry weather, which began in the latter part of March, continued, and 

 in some parts of the kingdom no rain fell during four or five consecutive 

 weeks ; but the prevalence of northerly winds tended to keep the tem- 

 perature low, and with the clear skies ground frosts at night were very 

 severe. The month was therefore a cold one, and the range of tem- 

 perature was very large, whilst the amount of bright sunshine was every- 

 where above the average. 



Observations made at Wisley : 



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. (complete saturation being 



represented by 100) 69% 



Rain fell on 8 days to the total depth of ... ... ... ... 0*49 in. 



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



Heaviest fall on any day 0-22 in, on the 27th 



The prevailing winds were from between west and north-east. 

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



There were 232*4 hours of bright sunshine, equal to 57 per cent, of the greatest 

 possible amount. There was only 1 day on which no sunshine was recorded. 



May. — The weather of May was changeable and unsettled, and, contrary 

 to its usual character, exceedingly dull and sunless. Over the southern 

 half of the kingdom the drought of April continued during the first week 

 or ten days of the month, after which there were frequent and heavy falls 

 of rain and several thunderstorms, so that in most districts the total fall 

 of the month exceeded the average. The winds were distributed pretty 

 evenly round the compass, but the temperature was generally below the 

 average, and its range was rather large. 



Observations made at Wisley : 



Mean temperature of the air in shade 52°-7 



Highest „ „ „ 74°-3 on the IBth 



Lowest „ „ „ ... 30°-2 „ 18th 



Lowest „ on the grass 22°-0 „ 18th 



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

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 51°-8 51°-5 49°-l 



Highest „ „ „ 57°-6 55°-9 51°-9 



Lowest „ „ „ 45°-2 46°-8 46°-5 



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



represented by 100) 75% 



