Chicago, Aug. 8,1894.
To the Editor:
—The elaborate and valuable paper of Dr. Richter on the "Influence of Atmospheric Pressure on the Prevalence of Pneumonia," published in the Journal for Aug. 4, 1894, I have read with great interest. One of the statements made by this writer requires explanation, that error may not be promulgated. I refer to that on page 189, second column, where it is stated that "Wells and Hirsch and every other writer on the subject discards air pressure as a causative factor." This would lead the reader to infer that the subject had been carefully investigated by these authors and that they had arrived at the conclusion that atmospheric pressure was not a factor in the etiology of pneumonic fever. Speaking only for myself I will say that in the series of articles to which Dr. Richter refers, expression has been given to the following opinion: