ON THE MEDICAL TOPOGRAPHY OF SINGAPORE. 
461 
From the inspection of this we may come to the following con¬ 
clusions. 
1st. That the mean temperature of this island is 2° 90 less than 
the temperature of other localities in a similar latitude according 
to Professor Meyer’s calculations. 2nd. that the month of May 
possesses the highest temperature, and the month of January the 
lowest. 3rd. that the range betwixt the mean temperature of May 
and January, being the months in which the highest and lowest tem¬ 
perature occur, extends only over 2 Q 7l>- 
On adding up the mean temperature of each month of each year 
observed, we have the mean temperature 
of 1841 1842 1843 1844 & 1845 
as 81.28 81.61 81.09 80.82 as 81.60 
from which we can draw this inference that for 5 years in succession 
the mean temperature did not vary one degree. 
From other tables which I cannot give,* 1 find the greatest maxi¬ 
mum temperature for the 5 years was 87° 5 and the greatest mini¬ 
mum 74° 7 the former occurred in June 1842, the latter in Ja¬ 
nuary 1843 by which we see that the greatest range was 9° 8 ano¬ 
ther conclusion to be drawn is that the mean temperature gradually 
increases from January to June, when it is at its acme ; and than as 
gradually decreases from June to January. 
is decidedly affected by the building, which is a Magnetic Observatory. The 
monthly tables which we have given for some time shew a considerable 
difference in the maxima and minima. The position of the thermometer is 
much better than that in the Observatory, but not free from objections. Ed. 
* These tables will be given at length hereafter accompanied by the Ob¬ 
server’s notes. To correct one or two inaccuracies in the text we give the 
deductions from these tables in the Observer’s own words. u From these 
data we can establish the following conclusions: that the range was gene¬ 
rally from 6^ to 7°,—that the greatest height to which the thermometer 
ever rose was 87 w 5 in the month of June 1842. whilst the lowest to which 
it ever fell was 74° 7 in the month of January 1843,—that the coldes t 
month in the year was January,—that the hottest was May, the mean of the 
former being 79 y 55 and of the latter 8i u 31,—whilst the mean tempera¬ 
ture describes a curve gradually ascending from January to May, and gra¬ 
dually descending from May to January,—that the mean temperature for 
the five years was 81° 25, and the difference between the hottest and cold¬ 
est months amounted to 2 W 76,— that the maximum temperature was at 
8 P. iff. and the minimum at 6 A. iff., — and that the mean of these two is 
nearly the mean temperature , so that cm observer registering the thermo¬ 
meter daily at6 A. M. and 3 P. M. would, by finding the mean, obtain the 
general mean temperature during the period o f observat ion, ED, 
