METEOKOLOGICAL OBSERVATIONS MADE AT CHISWICK IN 1900. 357 
At 1 ft. 
deep. 
deep. deep. 
Mean temperature of the soil at 9 a.m. ... 
51°.() 
54°.3 55°.6 
Highest 
57^0 
57°.5 57°8 
Lowest 
46°.5 
51°.3 53°5 
Mean relative humidity of the air at 9 a.m. 
(complete saturation being repre- 
sented by 100) 
SO 
Rain fell on 17 days to the total depth of 
1-73 in. 
(Equivalent to about 8 gallons on each square yard of surface in the Gardens.) 
Heaviest fall on any day O-oO in. on the 29th. 
November. — Very warm and rather dry. The days were, as a rule, 
2 degrees warmer, and the nights 3 degrees warmer, than is seasonable. 
On the coldest night the thermometer on the grass showed 13 degrees 
of frost. 
The rainfall was rather light, being about a quarter of an inch below 
the average for the month. 
Mean temperature of the air in shade ... ... ... ... 46°.2 
Highest ()1°.7 on the 1st 
Lowest 27°.2 „ 11th 
Lowest temperature on the grass ... ... ... ... ... 19°. 4 11th 
At 1 ft. At 2 ft. At i ft. 
ileep. deep. deep. 
Mean temperature of the soil at 9 a.m 47°.2 49°.9 52°.l 
Highest 53°.l 53°.l .53°.4 
Lowest 42°.8 47°.0 50°.0 
Mean relative humidity of the air at 9 a.m. (complete saturation being 
represented by 100) 87 
Rain fell on 18 days to the total depth of ... ... ... ... 1'78 in. 
(Equivalent to about 8 gallons on each square yard of surface in the Gardens.) • 
Heaviest fall on any day ... ... ... ... ... 0-36 in. on the 16th. 
December. — Most exceptionally warm and very wet. The days were, 
as a rule, about 6 degrees w^armer, and the nights about 7 degrees warmer, 
than is seasonable. On the coldest night the thermometer on the grass 
showed 10 degrees of frost. 
The rainfall was very heavy, being about 1 in. in excess of the 
average. 
Mean temperature of the air in shade 45''.0 
Highest 58°.6 on the 12th 
Lowest ;. 30°.l „ 24th 
Lowest temperature on the grass ... ... ... ... ... 22°.0 ,, 22ncl 
At 1 ft. At 2 ft. At 4 ft. 
deep. deep. dtep. 
Mean temperature of the soil at 9 a.m 45°.2 47°.l 49°.3 
Highest 48°.2 48°.5 49°.9 
Lowest 41°.8 45°.3 48°.2 
Mean relative humidity of the air at 9 a.m. (complete saturation being 
represented by 100) ... ... ... ... ... ... ... ... 89 
Rain fell on 16 days to the total depth of ... ... ... ... 2-45 in. 
(Equivalent to about 11 gallons on each square yard of surface in the Gardens.) 
Heaviest fall on any day ... ... ... ... ... 0*62 in. on the 30th. 
The Diagrams. — The averages with which the different mean monthly 
temperatures are compared in diagrams 1 and 2 are derived from the 
observations taken at Kew Observatory during the twenty-five years 
ending 1895. The actual averages for Kew have not been used, but the 
M 2 
