 J. J. Wettstein observed close affinity between 13 and 69.The affinity between 124 and 13 was remarked by Treschow and its resemblance to 69 by Andreas Birch.The first published account of Family 13 appeared in the year 1877, in a book published by T. K. Abbott on behalf of his deceased colleague (and discoverer of Family 13), William Hugh Ferrar.