AND GEOLOGY OF THE MALAY PENINSULA. 
113 
ture decreases. It can neither be said, however, that there is a 
regular increase from the minimum to the maximum, and decrease 
from the latter to the former, nor that the above four divisions 
mark successive seasons of constant cold or winter, of regularly increa¬ 
sing temperature or spring, of constant heat or summer, and of re¬ 
gularly decreasing heat or autumn.* 
In 1820 there was a regular increase from February to July. In 
1821 there was a very slight increment (0. 4°) from Feb. to March, 
followed by a fall in April of I. 8° and succeeded by a rise in May 
of 3. 5 Q . In 1822 there was a rise from February to May, in June 
a fall of 0. 7°, followed by a rise in July of 2°. In 1823 there was 
a rise from February to April, and a fall of 1° in May, followed by a 
rise of 1. 8° in June and July. In 1824 there was likewise a rise 
from February to April, a fall of 1. 4* in May and a rise of 1. 8° in 
June and July. In 1825 there was a fall from February to March 
of 0. 6°, a very slight rise in May, and a fall from May to July. Si¬ 
milar irregularities may be observed in the autumn months. In 
1820 July must be considered one of these months, as the tempera¬ 
ture fell from its maximum of 86° in June to 82. 1°, in that month. 
It then rose in August, September and October, and fell in Novem¬ 
ber, Dee. and Jan. (1821). In 1821 it fell from May to July, rose 
in August, fell in September, rose slightly in October and November, 
and fell in December and January (1822.) In 1822 it rose from 
August to October, fell in November and December and rose slight¬ 
ly in Dec. In 1823 it rose from August to Sept., fell in Oct. and 
Nov., and rose in Dec. and Jan. In 1825 July may be considered 
an autumn month. The temperature fell slightly in Augt., rose from 
September to November, and fell 2. in Dec, It thus appears 
that although the autumn months are colder than the summer, there 
* The seasonal variations in temperature appear lobe due in a great¬ 
er measure to the influence of the monsoons, than to the position of the 
sun. The temperature would probably be nearly equable throughout 
the year, but for the cold winds and rainy and cloudy weather that occur. 
Sometimes one of our so called winter months exhibits a mean tem¬ 
perature as high as one of the summer months in the same year. Thus in 
1821 the mean temperature at noon of November and July corresponded, 
83. 9°. In 1820 that of November was 82. 8° and that of July 82. 1®. In 
both cases however it is probable that the mean temperature of July ex¬ 
ceeded that of November, 
