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.'

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.