  We have reanalyzed data obtained by Potter in a 1923 experiment aimed at
testing whether the accelerations of test masses in the Earth's gravitational
field are independent of their compositions. Although Potter concludes that the
accelerations of his samples compared to a brass standard were individually
consistent with a null result, we show that the pattern formed from a combined
plot of all of his data suggests the presence of a fifth force coupling to
baryon number.
