It seems unnecessary to spend much time in describing the well known changes in the mucous membrane of the nose and throat that result from allergic reactions. It is also unnecessary to attempt any detailed classification of the cases or to go into the statistics. My experience is probably a duplication of the experience of most physicians who have given time and thought to this subject. It is sufficient to say that hay-fever and asthma, alike, are due to extrinsic or intrinsic irritants. Under the first heading are included pollens or dust, as, for instance, horse dandruff. Under the second heading are included foods and bacteria. The clinical manifestations are either seasonal or perennial. This brief classification can be enlarged, but it seems rather useless to do so.
I shall attempt to outline briefly some of my experiences with patients with "hay-fever" and asthma.
HISTORY TAKING
My experience is