This bibliographical note was drawn up to accompany Mr Collignon's memoir Recherches sur l'Enveloppe des Pédales des divers points d'une Circonférence par rapport à un triangle inscrit, printed in this volume, p. 2–34; and if I had remembered (as I ought to have done) the very full bibliography given in L'Intermédiaire des Mathématiciens (Vol. 3, p. 166–168, 1896) by Mr Brocard and others, I should not have commenced it. The result, however, has been that several articles on this particular curve, not noted in the Intermédiaire, have been discovered, and I have thought it worth while to print the information thus gained.