1 secretary Donado has written the letter himself.
7 a fool’s… own Proverbial (Tilley, G. 519).
12 indited composed
16 hand handwriting
16 prose ed. (I… Poggio, / Reads … Poggio Q)
20 fast firmly, utterly
22 the colour of his beard Probably just a periphrasis for age; it is tempting to suppose a latent pun on ‘white lie’, but OED does not record the term in use before 1741.
23 board ‘chat up’, make sexual advances (to Annabella); an alternative might be ‘bourd’ (= jest) occasion opportunity
or either (= ‘on the one hand’)
25 in spite of your teeth whether you like it or not (literally, notwithstanding your resistance)
30–1 prose ed. (Here’s… all, / Pray… Letter? Q)
40 Probably addressed to Donado (Poggio usually calls Bergetto ‘master’ rather than ‘sir’).
41 apish foolish (literally, like a monkey imitating a human being) motions puppet-shows
42 you… no you’ll regret it (literally, you had better not have done so)
44 take… whipping beware beating (as a punishment for disobedience)
45 prose ed. (Dost… Poggio, / Come … Poggio Q)