440 
DR. DAVY ON THE TEMPERATURE OF MAN WITHIN THE TROPICS. 
effect in modifying the temperature of the body within the tropics, where the varia- 
tions of atmospheric temperature throughout the year are so inconsiderable — circum 
stances, for instance, of state of health, kind of life led as to exercise, diet, &c., and 
quality of atmosphere, as to degree of moisture or dryness, and the direction and 
force of the winds. 
3. Of the Effect of Active Exercise on the Temperature and of Rest after Exercise. 
On most occasions, when active exercise was taken, especially when on military 
duty, the dress worn was heavier and warmer than that in common use, to which 
partly the increase of temperature observed may be justly referred. This remark 
applies to the majority of the following observations : — 
Tongue. I Pulse. 
I 
Respira 
tions. 
• Air of 
room. 
December 17 , 1846, 1 p.m. After attending an inspection of a regiment on 
parade, exposed to the sun about half an hour 
o 
99-3 
66 
17 
82 
December 28 , 1846, 3 p.m. After returning from office in Barbados, with 
some difficulty in carriage, the latter part of the road being flooded, a tor- 
rent rushing over it, 4‘39 inches of rain having fallen between 9 a.m. and 
.3'' 30*" P.M 
99- 
56 
17 
16 
75 
December 28 , 1846, 4 p.m. The last hour sitting lightly clad 
98-1 
52 
77 
January 5, 1847, 1 p.m. After visiting hospitals 
99'3 
54 
16 
82 
January 5, 1847, 4 p.m. The last hour sitting lightly clad, reading 
98-0 
50 
14 
78 
January 6, 1847, 1 p.m. After inspecting an hospital 
99*2 
54 
15 
82 
January 6, 1847, 4 p.m. Since 1 p.m. chiefly reading, lightly clad 
98-2 
50 
14 
81 
March 26, 1847, 4 p.m. After inspecting hospitals, &c., occupied several 
hours, the greater part of the time walking 
99-8 
70 
16 
85 
March 29, 1847, 6 a.m. After rising, before any exertion 
98-4 
56 
15 
68 
March 29, 1847, 9 a.m. After a walk of three hours, ascending and descend- 
ing a hill in the neighbourhood of Port of Spain, Trinidad; perspiring ... 
99-1 
68 
17 
79 
March 29, 1847, 7 ^ 30"* p-m. After a ride of about four hours, most of the 
way at a quick pace ; perspiring 
99-6 
78 
17 
80 
April 3, 1847, 6 a..m. Just risen 
98*2 
54 
14 
73 
April 3, 1847, 1 p.m. At the foot of the fall of the Marraca, in Trinidad, 
approached by a steep ascent through forest, an hour’s walk, preceded by 
a ride at a quick pace of several miles; perspiring, temperature of hand 
99°'5 ; that of the air (81° at the fall) was comparatively low from the eva- 
poration of copious spray 
100- 
no 
20 
81 
April 3, 1847, 6** 15*" p.m. On return from Marraca; the last few miles in 
an open carriage 
98-7 
68 
16 
79 
April 10, 1848, S'* 30"* p.m. After inspecting the hospital at St, Vincent 
and riding an hour or two 
99-4 
62 
16 
85 
April 11, 1848, S'* 30"* p.m. After visiting the barracks; perspiring 
99-4 
78 
17 
84 
July 15, 1848, 1 p.m. After a ride of about an hour from Courland Bay, 
Tobago 
99-6 
64 
16 
83 
July 15, 1848, 6** 30"* p.m. After visiting barracks, &c 
99-7 
64 
15 
81 
These results (many more of the like kind might be given) show how readily, when 
in health, the temperature of the body rises from active exercise and subsides on 
rest, — both, very much in the same manner and degree as in a cooler climate ; and 
also, unless the exercise be severe, how the temperature is proportionally more 
affected than either the pulse or respiration. 
