The treatment of allergic diseases in the respiratory tract sometimes also includes cortisone therapy. A local application of cortisone on the shock organ should imply a reasonable possibility of preventing the systemic side-effects often observed in connection with prolonged peroral or parenteral steroid treatment. With this in view, cortisone, hydrocortisone, prednisolone, and dexamethasone-among other drugs-have been tried (3,5,6,8,17, 18,19,20,21,22), but all of them have proved to have an insufficient effect in doses without systemic resorption. There was renewed interest in the local application mode of treatment with the introduction of beclomethasone dipropionate and betamethasone valerate. In reports on the treatment of bronchial asthma by Brown et al. (i), and of allergic rhinitis by Mygind (15), the good therapeutic effect of beclomethasone dipropionate has been brought out. The preparation has been evaluated as a high-grade, locally active gluco-corticoid which is effective without any considerable side-effects. On the basis of prior investigations, we did not find the recommendations of dosage established. It is desirable to aim at still lower dosage while maintaining the effect of a drug. In the present report, results are given of trials with beclomethasone dipropionate against hay fever in lower dosage than in earlier investigations.