Further observations on the air conditioning mechanism of the nose.

If the air conditioning mechanism were directly related to the requirements of the lower respiratory tract it would be expected that there would be dilatation of arterioles and capillaries to warm cold air and filling of sinusoids to moisten dry air. To throw further light on these questions I have, during the last few years, carried out experimental investigations, the result of which, although as yet confusing and incomplete, I propose to record. Many writers have published valuable communications on the same subject, but the purpose of the present paper is to describe a somewhat different approach.