[1362] John of London was a master, and contemporary of Roger’s; Op. Ined. p. 34. ‘Juvenis Johannes’ was aged 20 or 21 in 1267, and had no experience in teaching, ibid. 61.
[1363] The dates are conclusive; Peckham entered the Order as a young man, not as a boy, in the lifetime of Adam Marsh; Mon. Franc. I, 256. ‘Juvenis Johannes’ was about 12 years old when Adam died.
[1364] Op. Ined. 63.
[1365] Ibid. 61.
[1366] Ibid.
[1367] Ibid. 62.
[1368] Namely, a treatise on rays, Op. Ined. p. 230, and an elaborate one on mathematics and judicial astrology, ibid. 270; John took also a concave lens, ibid. p. 111.
[1369] Ibid. 62.
[1370] MS. Gray’s Inn Libr. 7, f. 62, ‘a quadam villa proxima que dicitur Herteford.’
[1371] MS. Gray’s Inn Libr. 7, f. 62.