ON THE MEDICAL TOPOGRAPHY OF SINGAPORE. 
403 
round their nutmeg 1 trees. A familiar illustration of the greater 
coolness of vegetation will nightly be seen in the greater quantity of 
dew deposited on the blades of grass than on a gravel walk, and all 
know that the shade of a tree is much cooler than the shade of a 
brick wall. The cutting of the jungle and clearing of the land round 
the town of Singapore has therefore most perceptibly increased its 
temperature, and fully accounts for the difference of 2° 48 between 
the mean of Captain Davis’ observations and those taken 20 years 
later at the Singapore Observatory ; and as I before mentioned 
has confined the spread of the cool land-wind, giving rise to moist 
hot nights, in which a wind called the An gin Jdivd is supposed to 
be blowing. 
Table No, 5, 
Months. 
The mean 
of Solar 
Radiation 
fThe mean 
i of Terres¬ 
trial Ra¬ 
tion. 
The mean 
of the hour 
-ly read¬ 
ings of the 
Baromet’r 
Remarks. 
January,... 
February .. 
115°.33 
68° .20 
29°.917 
The Solar Radiation for Ja- 
119. 62 
63. 02 
29. 914 
nuary is the mean of 3 years, 
March,.... 
119. 87 
64. 52 
29. 884 
for the other months 4 years. 
April,. 
119. 90 
67. 04 
29, 886 
The Terrestrial Rad. for Ja- 
May,.. 
122. 97 
67. 90 
29. 872 
nuary is themean for 4 years, 
June,. 
119. 97 
66. 40 
29. 858 
as well as the months .of Sept. 
July,. 
121. 62 
66, 52 
29. 868 
Oct., Nov. and Dec., the rest 
August,. .. 
123. 52 
66. 42 
29. 880 
of the months are 5 years*— 
September. 
125. 02 
66. 95 
29. 886 
The observations on the Ba- 
October,... 
122. 32 
65. 37 
29. 897 
rometer are for 5 years, ex- 
Novr.. 
125. 52 
64. 95 
29. 866 
cept during the months of 
l)ccr. 
122. 35 
66. 
29. 884 
,21 
Sept, Oct., Novr. and Deer., 
which are for 4 years. 
All explanations or inferences to be drawn from Table No. 5, I 
beg to be excused from making, as the talented observer will him¬ 
self I understand on some future opportunity do so; but one fact 
will strike the reader that the Barometer may he said to be at its 
mean height at 29° 880 ; and that it never varies more than one- 
twentieth of an inch, one month with another, shewing the little 
change there is in the elasticity of the Atmosphere. 
This equality of temperature and slight variation in the elasticity 
