This window is a memorial to Rev. Lewis William Sampson and is shorter than the others because it is above the south door, and for that reason is not all visible at ground level. It deocts the Purification of Mary, or Presentation of Christ at  the Temple, and the Nunc Dimittis. Creator not currently known.
<a href="//commons.wikimedia.org/wiki/User:Rodhullandemu" title="User:Rodhullandemu">Rodhullandemu</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>