Observations on 32 cases of bronchial asthma and psychosis were studied with regard to the occurrence of asthmatic symptoms in various stages of the psychotic process. Three cases were presented in detail, illustrating the two most common relationships between asthmatic symptoms and psychotic episodes. These were (a) co-existence, by which is meant the presence of asthmatic symptoms prior to psychosis, during the psychosis and during remissions when they occur; and (b) antagonism, by which is meant sence during the overt psychosis, and their reappearance during remission. Both relationships were occasionally observed in the same patient during different psychotic episodes, depending on the level of psychosis.