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May 11, 1889

The Causation of Pneumonia.

JAMA. 1889;XII(19):680-681. doi:10.1001/jama.1889.02400960032010

Dear Sir:  —This is an attempt to summarize certain evidence presented in the valuable "Introduction to the Study of Pneumonic Fever" by Edward F. Wells, M.D., being published in The Journal, and to group that evidence relative to epidemics by seasons of the year with evidence relating to the increase and decrease, by seasons of the year, of pneumonia other than epidemic.On pages 259-262 of The Journal for Feb. 23, 1889, Dr. Wells gives a table of chronology of epidemics of pneumonia, stating the country, the year, and the season of the year, in which each epidemic occurred. I have footed his column relative to the season of the year, and find the result as stated in my Table I as follows:The study of the subject by quarters of the year is not as satisfactory as by months, and especially as I wish to compare the result with