DR. DAVY ON ANIMAL HEAT. 
61 
latter 96 0, 5. The observation too on the old man in Grasmere, made in February 
in cold weather, is also favourable to this conclusion : whilst those made at the same 
time, on the other two old persons in stronger health, seem to show, that, provided 
there is a vigorous action of the heart and free circulation of the blood, the tempera- 
ture of the body is easily maintained. 
III. On the Effect of Air of different Temperatures on Animal Heat. 
As from observations made on man on entering the tropics, and within the tropics 
on descending from a cool mountainous district to a hot low country, it would ap- 
pear that his temperature as measured by a thermometer placed under the tongue is 
liable to fluctuate, — rising one or two degrees in a warm atmosphere, and falling as 
much on entering a cool one*, — it seemed probable that like differences of effect 
might be produced by air kept at different degrees of temperature in buildings in this 
country. 
In the autumn of last year, when going through the cotton manufactory of Dean- 
stone, in the neighbourhood of Doune in Stirlingshire, — an establishment admirably 
conducted and in the highest order, — I availed myself of the opportunity to try the 
temperature of a few individuals in relation to this question. In the room called the 
“ piecing-room,” where a high temperature is always required on account of the 
kind of work, — a temperature kept up by means of warm air and steam, — when at 
92°, I found the thermometer placed under the tongue of one man who had been at 
work there about six hours, rise to 100 o, 5 ; and of another, who had been there the 
same time, to 100°: the former was 52 years of age, healthy, his pulse 64 ; the other 
33 years of age, in pretty good health, but liable to acidity of stomach ; his pulse 78. 
In an adjoining room, where the temperature of the air was 73°, the thermometer 
placed under the tongue of a young woman rose to 99° ; and in a large room, where 
300 persons were employed in weaving, and where the temperature of the air was 
60°, the thermometer placed under the tongue of another healthy young woman rose 
only to 97°'5. 
Few as are these observations, they seem to warrant the conclusion that a high 
temperature of even a few hours in the heated air of a room is capable of raising the 
temperature of the body above its usual standard, in accordance with what had been 
anticipated from the effect of different degrees of atmospheric temperature. 
In further confirmation of the same, I may briefly state the results of multiplied 
observations made on the temperature of the same individual. The subject of them 
was of middle age, in good health, under whose tongue the thermometer commonly 
was stationary at 98°, when neither suffering from heat nor cold. The place where 
they were made was Constantinople, — the climate of which capital, it may be ob- 
served, is exceedingly variable, — often cold in winter and the early spring, and com- 
monly very hot in summer, — liable to great vicissitudes from its situation on the 
* Op. cit. i. 169. 
