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JAMA. 1922;79(24):1970-1973. doi:10.1001/jama.1922.02640240004002.
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During the last few years considerable attention has been paid to the study of asthma, particularly from the allergic point of view. The progress that has been made along these lines has unquestionably added much to our knowledge of the subject. It has enabled us at least to classify between 40 and 50 per cent, of asthmatic cases as being due to sensitization by foreign proteins, so that the outlook for improvement and cure has been increased to that extent. This has largely been due to the work of Schloss,1 Walker,2 Cooke3 and Vander Veer,4 Longcope,5 Mackenzie,6 Rackemann7 and Talbot.8 Through the researches of these investigators, especially Walker,2 Cooke3 and Vander Veer,4 it has been established that the majority of sensitive asthmatic patients fall into certain age groups. The greatest incidence of sensitive cases is to be found in


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