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In the above-stated communication, after alluding to Dr. Rattray’s observations and remarking that I had formerly held the same views as he did, namely, that less carbonic acid was exhaled under increasing temperatures of the sun; I add, I am now compelled, however, to alter this view, and to conclude that more carbonic acid is formed in the body under a tropical or nearly tropical sun than under temperate latitudes. Lest I should be considered as ascribing to the sun’s heat a power which so far has not been acknowledged by physiologists, namely, that of increasing the formation of carbonic acid or the combustion in the body, I must beg to explain in a few words how the question now stands. I shall end by asking leave to suspend any opinion as to the cause of the increase of combustion in the body I observed to take place on the Island of Teneriffe, until more direct experiment has been brought to bear on the subject.

proceedings of the royal society of london

XXII. Note on the paper (read April 24) 'a summery of an inquiry into the function of respiration at various altitudes on the Island and peak of Teneriffe.'