Undoubtedly the seasons at which the different experiments were made have an effect on our results apart from the simple absolute temperatures concerned. There is no doubt that the vaso-motor esystem of nerves plays an important part in the alterations of the peripheric temperature generally; and it would further appear that the steady elevation or depression of the atmospheric thermal mean accompanying the change of the seasons, acts more constantly and persistently on these nerves than transient and irregular variations of the temperature of the air. In a recent article on the peripheric temperature, M. Louis Couty has given evidence that the temperature of the palm of the hand is affected in a manner according with the above view.* Now the experiments of Table 1 were made in August and September; those of table 2 in March and April ; and those of Table 3 and 4 in December, January, and February. Unfortunately the tables for the winter months do not range sufficiently high, and those for the spring and summer months do not range sufficiently low, to admit of a comparison of the effect of the same temperature of the air, at different seasons, on the temperature of the head. To make this comparison, the ranges of the atmospheric temperatures in the tables would have to be extended both upwards and downwards by artificial means.

“Recherches sur la température périphérique, &c.," "Archives de Physiologie normale et pathologique,' Jan. and Feb., 1880, p. 94.

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