Forty-one experiments with positive and negative atmospheric ions were performed on 19 children, of whom 13 were suffering from asthmatic (spastic) bronchitis. The results of these experiments indicate that the atmospheric ions have the following effects. Negative ions 1. Shorter duration of the spastic attack as compared with duration of the attack in children receiving the conventional therapeutic treatment. 2. Reduction of tachypnea in cases of spastic bronchitis and bronchopneumonia. 3. Termination of spastic attacks induced by positive ionization. 4. The effect of negative ions on respiratory spasticity usually becomes obvious about 8 hours after the beginning of the ionization. 5. When the negative ionization is stopped, a moderate rebound of spasticity and tachypnea was noticed in several cases. Positive ions 1. Induce spastic attacks in normal infants. 2. Cancel the therapeutic effects of negative ions on patients with spastic bronchitis. 3. Cause tachypnea in infants. 4. On the average, the effects of these ions on respiratory spasticity becomes evident about 10 hours after the beginning of ionization.