Abstract
Abstract In the course of the investigation reported in the previous paper we examined for the presence of agglutinins when the normal sera of horse, donkey, and mule are tested with the blood of these same animals. The same question is dealt with in a recent communication by Walsh (1). His results and conclusions differ from ours in some important points. In our opinion the subject is not largely connected with the problem of the inheritance of species-specific properties, since most of the reactions observed have the character of isoagglutinin reactions and have therefore nothing to do with species-differences. For the same reason these studies are related to the very interesting work of von Dungern and Hirschfeld (2), Epstein and Ottenberg (3, 4), and others on the heredity, in human beings, of isoagglutinable substances which were found to follow the Mendelian laws.
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