Donald Baxter MacMillan standing by a cairn
"This left some men and dogs over, so that it was not serious news when MacMillan called my attention to a frosted heel with which he had been worrying along for several days without saying anything to any one about it. I saw at once that the only thing for him to do was to turn back. It was a disappointment to me to lose MacMillan so early, as I had hoped that he would be able to go to a comparatively high latitude; but his disability did not affect the main proposition. I had ample personnel, as well as provisions, sledges, and dogs; and the men, like the equipment, were interchangeable."- Robert E. Peary in The North Pole, published in 1910
"Donald MacMillan at cairn" by Donald B. MacMillan, 1908, Peary-MacMillan Arctic Museum Collections