The voluminous literature published during the last ten years, concerning the subject of allergy and its associated manifestation, has aroused a widespread interest in practically all branches of medicine. Clinical and laboratory studies of so-called hypersensitive subjects, made by numerous authors, with case reports and statistics showing encouraging results obtained by therapeutics, based on the information gleaned from cutaneous and intracutaneous tests has prompted others to apply this method in the treatment of those cases which might possibly be classified with the allergic group. Idiopathic headaches and pains, epilepsy and neuropathies, vertigos and obscure intranasal conditions are being investigated; also hay-fever, asthma, urticaria and food idiosyncrasies from a hypersensitive point of view. Pediatricians especially, have been interested since the demonstration by Schloss,1 Blackfan,2 O'Keefe3 any many others, of the relation existing between protein sensitivity and infantile eczema.
With the object in view of determining what