36 VEGETATION OF THE PEAK DISTRICT [CH. 
The lowest readings were registered on October 8rd, 1908, 
and on January 28th, 1909, when the humidity fell so low as 
25 per cent. at 750m. The month of May, 1909, is interesting 
on account of its low atmospheric humidity in this district. 
The monthly average at the three altitudes of this month was 
65 per cent.; and, at 500m., out of the 25 days on which 
readings were taken, the humidity fell below 60 per cent. on 
12 days. The number of days on which the atmospheric 
humidity fell below 60 per cent., and the monthly distribution 
of these days, are indicated below: 
500 m. | 750 m. 
January af 
February = 
March 5 
2 
April oi 
1 
May 25 
1 
June 36 
2 
July 21 
0 
August 20 
1 
September 35 
1 
October 26 
0 
November 24 
Ae 
December 7 
13 
Total 
bo 
é 
ee 
* The numerator represents the number of days on which the atmospheric 
humidity fell below 60 per cent., and the denominator the number of days on 
which observations were taken. 
