In the "Beke" grotto of Jósvafö 222 patients with an obstructive syndrome (respiratory blast value below 70) wer examined for the therapeutic results of therapy, with treatment made for five hours a day and for an overall period of three weeks. After climatotherapy, an increase in the FEV value by more than 15% was observed in 30% of the patients and in 36% of the hyperergic-allergic group. The respiratory function was found to have changed for the worse in 8%. The whistling nosie observed at the beginning of treatment disappeared in 51%, and coughing and suffocation improved in one half of the case. During treatment the consumption of drugs decreased in 52% and showed and increased in 4.7%. With the comparable group of patients treated in the hospital, improvement of the respiratory function was less conspicuous, whereas the symptomatic rate of improvement was twice as high. The mechansim of action of climatotherapy in the grotto and the indication of treatment are discussed.