HUG 1, ff. 088r, inc. scait faire un calcul qui est facile
Incipit:scait faire un calcul qui est facile
Huygens lettered f. 88r "E". A line drawn from the bottom left corner of the page to the incipit seems to indicate that the text is a continuation of work on the torn out folios which would have preceded this page. Part of a draft of letter #2341.