SummaryThe specific desensibilisation of allergy to pollen seems to he the best method, since it brings a very great improvement in 60 % of the cases in a scries of patients particularly affected and never improved previously by other treatments.In less severely struck patients one gets generally good results in 75 and 80 % of the cases. Moreover, persistance of the good results for a few years or even definitively can he hoped for using this method.