1078 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



ending 1895. The actual averages for Kew have not been used, but the 

 departures in mean temperature, &c., from the monthly means for 1902 

 at that Observatory have been applied to the Chiswick temperatures ; and 

 in this way very close approximations to the true monthly averages have 

 been obtained. Mr. Glaisher's discussion of the Chiswick temperatures, 

 1826-69 (referred to in Vol. xxiii. page 391), was not available for this 

 purpose, as it gives no maxima or minima temperatures. The rainfall 

 averages used in diagram 1 are, however, those given by Mr. Glaisher for 

 the forty-four years ending 1869 at Chiswick. 



DIAGRAM I . Variation from the average 

 ramfalL for couch month during the 



tamea/h temperature 

 Year 1 90 Z 



and 



1. Average or seasonable Temperature. 2. Average or seasonable Rainfall. 



Fig. 256. 



Diagram 1. — This diagram (fig. 256) shows at a glance the general 

 character of the weather of each month of the year as regards temperature 

 and rainfall. For instance, it will be seen that between March and 

 October, or during that part of the year when vegetable growth is most 

 active, there did not occur a single unseasonably warm month ; January 

 and February were about equally exceptional as regards temperature, the 

 former being as unseasonably warm as the latter was cold. Then as 

 regards rainfall, it will be noticed that the only really wet month of the 

 year was June, while January, February, April, and October were all 

 unusually dry. 



