| Description | Consists of :
<i>advance proof of "On Correlation and the Character of Variable Stars: in Reply to Professor Karl Pearson" by H C Plummer</li>
<li>second proof "On Correlation and the Character of Variable Stars: in Reply to Professor Karl Pearson" by H C Plummer, published in <i>Monthly Notices of the Royal Astronomical Society</i>, no 5, vol 69, 1909. Annotated. |