Abstract
A number of articles and reports have appeared in the last few years dealing with the appearance of diphtheria bacilli in the nose and throat of cats and drawing the inference that these animals are more or less frequent carriers of diphtheria. In view of the findings in human throats, noted in a previous article,1 indicating the danger of making an incorrect diagnosis of diphtheria on account of the presence of B. lactimorbi, it occurred to one of us that some of these reports might be due to morphologic appearances of a similarly deceptive nature. To determine the truth or falsity of this theory cultures were made from two series of cats, and all organisms growing out on serum with the formation of metachromatic granules were isolated. It was originally intended to carry out the same technic with other groups of cats, but the results in the first two series made this unnecessary. One set of cats was examined at the kennels of the Humane
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