^{page 202 of note *} Math. Gazette, XXXI, 252.

^{page 202 of note †} XIX, 80.

^{page 202 of note ‡} XV, 401.

^{page 202 of note §} There is no need in the definition for Δx to be small, and it is better with beginners to avoid the term “infinitesimal”

^{page 202 of note ‖} See Durell, and Robson, , Elem. Calculzus, p. 27 Google Scholar ; or XV, 402.

^{page 203 of note *} As pointed out in footnote 3 of XIX, 83.

^{page 203 of note †} See, e.g., de la Vallée Poussin’s Cours d’Analyse, or my Course of Analysis.

^{page 204 of note *} XVI, 10.

^{page 204 of note †} See Picken, XIX, 79 seq.