A survey of the city of Colorado Springs with regard to the incidence of the major allergic diseases was undertaken during the last twelve months. The general impression among the physicians of this city during the last few years has been that there was a decided increase in the prevalence of hay fever and asthma. Colorado Springs and its environs have long been a mecca for health seekers. This community is widely noted for its beautiful and comfortable homes, broad clean streets, supervised play grounds and well developed public utilities. It is a center of culture, education and recreation, as distinguished from a community characterized primarily by industrial, commercial or service factors. The population is to a large extent native born, the chief foreign groups being English, German and Canadian. There is more than the average preponderance of females over males and a larger proportion of persons in the later