52 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY, 



usual which came in October had become badly needed by the time 

 it arrived. The warm spring and autumn, separated by the cool 

 July and August, are shown by the diagram in the upper section of 

 the figure. 



Fig. 20 shows the relation between the temperature of the air and 

 of the soil. In the corresponding diagram for 1912 (vol. xxxix., p. 48) 

 the temperature rises steadily to a maximum in July and then as 

 steadily decreases to the close of the year ; the curves for 1913 exhibit 

 a more normal progress of the phenomenon, the change between June 

 and September being sHght, indicating a greater duration of the warmth 

 of summer both in the air and in the soil. 



JAN fEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 



Fig. 20. — Mean Temperature of the Air, and of the Soil at the Depth 

 OF One Foot and of Four Feet below the Surface, for each Month. 



In fig. 21 the predominance of winds fromt he south to west quad- 

 rant is shown, and by the shaded circle in the centre the relative 

 frequency of calms. 



Fig. 22 shows the mean daily range of temperature in the air, 

 and also the difference between the mean minimum temperature of 

 the air, as recorded in a closed screen four feet above the soil, and that 

 registered by a thermometer laid upon the grass and fully exposed 

 to the sky — conditions analogous to those experienced by plants 

 growing in the open. 



The observations for the several months are as follows : 



January. — ^The year began with a continuation of the remarkably 

 mild weather with which its predecessor had closed, and in nearly 

 every part of the kingdom it remained comparatively warai and open 



