| Description | <p>Pearson's preparatory lecture notes and calculations, consisting of:</p>
<p>Letters from M Greenhill regarding data on relative variability.</p>
<p>Tables of data on relative variability of sexes, child head sizes, eye colour, duration of life, strength, skull and bone measurements</p>
<p>Notes on the <i>Descent of Man</i>.</p>
<p>Calculations and equations.</p> |