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ON THE

INFLUENCE OF THE TEMPERATURE OF

THE AIR

ON THE

TEMPERATURE OF THE HEAD.

BY

J. S. LOMBARD, M.D.,

FORMERLY ASSISTANT PROFESSOR OF PHYSIOLOGY IN HARVARD UNIVERSITY.

LONDON:

H. K. LEWIS, 136, GOWER STREET:

EXPERIMENTS

ON THE

INFLUENCE OF THE TEMPERATURE OF

THE AIR

ON THE

TEMPERATURE OF THE HEAD.

The object of the experiments contained in the following tables was to obtain a general idea of the extent to which the temperature of the surface of the head is affected by the temperature of the surrounding air. The observations were made on two individuals, both the subjects of many previous experiments of a similar nature, and in whom the ordinary normal variations of the temperature of the head had been proved to be nearly the same. In the different observations all the essential experimental conditions, except the temperature of the air, were, as far as possible, regulated to uniformity. Both thermometers and thermo-electric apparatus were employed in obtaining the temperature of the head, which was taken on the left side in the space behind the external angular process described in the first article of this book.* The method of procedure was to note the temperatures of the air, and of the head, respectively, in five successive observations at intervals of one minute each, after waiting, in the first instance, a sufficient time for equilibrium to be established between the instrument-thermometer, or thermo-pile--and the head. If, at the end of the five minutes, no alteration of temperature either of the air or of the head had occurred, the temperature of the air was changed artificially, and a new set of observations made. The results contained in the tables are, therefore, in sets of five observations each, or in some multiple of that number, when two or more similar sets are added together in one item.

* P. 8.

Each of the first four tables represents a separate and distinct period of investigation extending over two or three months.

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35.40°C.
35.35°C.
34.90°C.
34.85°C.
35.50°C.
35.40°C.
35.00°C.
34:80°C.
35-50°C.
35.20°C.
35-40°C.

18
5

13:8888°C.

35.15°C. 35.20°C. 35.15°C. 35.35°C. 35.30°C. 35.90°C. 35.40°C. 35.35°C. 35.30°C. 35.25°C. 35.20°C.

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10

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15.5555°C. 15.0000°C.

10

5 10

Temperatures of

Temperatures of

Number

of experiments.

Number

of experiments.

Air.

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13:8888°C. 13-3333°C.

11.6666°C.

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34:70°C. 34.20°C. 35.65°C. 35.40°C. 35.20°C. 34:25°C. 35:35°C. 34:35°C. 34:25°C. 33.90°C. 33.80°C. 34:30°C.

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12-7777°C. . 12.2255°C. 12:2222°C.

11-7222°C.

10.5555°C.

TABLE 3.

8.8888°C.

10

14:1666°C. 13.3333°C.

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Head.

35.00°C. 34.90°C. 35.35°C. 35.20°C. 34:90°C. 34.60°C. 34:40°C. 35•70°C. 34:50°C. 35.05°C. 34:50°C. 35.10°C. 35.00°C.

35.55°C. 35.90°C. 35.75°C. 35.60°C. 35.15°C. 35.00°C. 35.50°C. 35.90°C. 3570°C. 35.80°C. 35.60°C. 35.75°C. 35.45°C. 35.40°C. 35.40°C. 35.20°C. 35.00°C. 34.65°C. 34.20°C. 35.50°C. 35.25°C. 35.20°C. 35.10°C 3440°C. 35.50°C.

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35.20°C. 35.10°C. 35.05°C. 34.90°C. 34:80°C. 34:75°C. 34.60°C. 34:55°C. 34:30°C. 34:25°C. 34.20°C. 34:15°C. 33.95°C. 33.65°C. 33:10°C. 34.90°C. 34.60°C. 34:30°C. 34:10°C. 33.45°C. 34:55°C. 34.40°C. 34.20°C. 34:05°C.

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10-0000°C.

8.3333°C.

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8.8888°C.

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