extent to the milder and less outspoken course of the disease in them.
Five times more syphilis in men than women conservatively summarizes our
present conceptions. The importance of distinguishing between syphilis
among the sick and among the well is often overlooked. For example,
Landouzy, in the Laënnec clinic in Paris, estimated recently that in the
patients of this clinic, which deals with general medicine, 15 to 18 per
cent of the women and 21 to 28 per cent of the men had syphilis. It is
fair to presume, then, that such a percentage would be rather high for
the general run of every-day people. This accords with the estimates,
based on large experience, of such men as Lenoir and Fournier, that 13
to 15 per cent of all adult males in Paris have syphilis. Erb estimated
12 per cent for Berlin, and other estimates give 12 per cent for London.
Collie's survey of British working men gives 9.2 per cent in those who,
in spite of having passed a general health examination, showed the
disease by a blood test. A large body of figures, covering thirty years,
and dating back beyond the time when the most sensitive tests of the
disease came into use, gives about 8 per cent of more than a million
patients in the United States Public Health and Marine Hospital Service
as having syphilis. It should be recalled that this includes essentially
active rather than quiescent cases, and is therefore probably too low.

+Current Estimates of the Prevalence of Syphilis.+--The constant upward
tendency of recent estimates of the amount of syphilis in the general
population, as a result of the application of tests which will detect
even concealed or quiescent cases, is a matter for grave thought. The
opinion of such an authority as Blaschko, while apparently extreme,
cannot be too lightly dismissed, when he rates the percentage of
syphilitics in clerks and merchants in Berlin between the ages of 18 and
28 as 45 per cent. Pinkus estimated that one man in five in Germany has
had syphilis. Recently published data by Vedder, covering the condition