136 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



abnormal, both in amount and distribution, the fall over Southern Eng- 

 land, and along the Eastern Coast right up to the North of Scotland, 

 being double the average, while in the West generally it was below the 

 average, and in the West of Scotland very much so. At Wisley there 

 was rain on twenty-four days, and the amount of bright sunshine 

 registered was only 19 per cent, of the possible amount. 



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



Mean temperature of the air in shade 





39°.l 





Highest „ „ „ ... . 





58°.0 on the 29th 



Lowest „ „ „ ... . 





14°.0 „ 



2nd 



Lowest ,, on the grass 





11°.0 „ 



5th 



Number of days of ground frost 







16 





At 1 ft. 



At 2 ft. 



At 4 ft. 





deep. 



deep. 



. deep. 



Mean temperature of the soil at 9 a.m. 



33°.8 



39°.6 



40°.3 



Highest „ „ „ ... . 



46°.2 



44°.9 



43°.l 



Lowest „ ,, „ ... . 



34°.2 



36°.3 



39°.l 



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



(complete saturation being 





represented by 100) 







88% 



Kain fell on 24 days to the total depth of... 







5-31 in. 



(Equivalent to about 15f gallons of water to 



the square yard.) 







Heaviest fall on any day 





0-90 in. on 



the 6th 



The prevailing winds were at first' northerly and easterly; then southerly. 

 The average velocity of the wind was not recorded. 



There were 69 hours of bright sunshine, equal to 19 per cent, of the greatest 



possible amount. 

 There were 10 days on which no sunshine was recorde(i. 



April. — The month opened with a spell of fine weather, and during 

 the first fortnight there was a succession of days of brilliant sunshine 

 and seasonable warmth. Following upon this came some showery 

 weather, but bright sunshine was fairly plentiful right through the 

 month, there being only one day on which none was recorded. Tem- 

 perature was above the normal, but night frosts were rather frequent 

 and occasionally the thermometer fell to a rather low point, the daily 

 range being in consequence large ; over the Eastern Counties the mean 

 temperature was nearly 3° above the average. The rainfall as Wisley 

 was 2 in., but in some districts it did not exceed an inch, although in 

 others — mainly in the West — the total fall was very large. The amount 

 of sunshine at Wisley averaged eight hours per diem. 



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



Mean temperature of the air in shade 48°.4 



Highest „ „ „ ... 71°.0 on the 10th 



Lowest „ „ „ 27°.0 „ 2ud 



Lowest „ on the grass 20°.0 „ 7th ! 



Number of days of ground frost 13 | 



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



deep. deep. deep. ! 



Mean temperature of the soil at 9 a.m 47°.0 47°.5 45°.7 | 



Highest „ „ „ 51°.9 51^.1 48°.7 



Lowest „ „ „ 41°.l 43°.6 43^.4 



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



represented by 100) ... 74 % I 



