It appears that the proportion of chancroid in the list is very high. According to our observations in France, we found, as already mentioned, that a thorough washing with soap and water followed by a mercuric chlorid irrigation was necessary to prevent chancroid. The absence of this preventive measure may furnish a partial explanation of the question pre¬ sented by Riggs' statistics. Surgeon Henry of the United States Navy reported 529 prophylactic treatments with four cases of gonor¬ rhea

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... owing ; two of these men had received treat¬ ment more than twelve hours after exposure, and