=25. VATVM PECTORA NVTRIT.= _Nutrit_ here seems to mean 'sustain'. Its usual transferred sense is 'cause to grow', as at III iv 26 (the only other passage I have found where the verb is used of poetry) and Hor _C_ IV iv 26.
=27. VIX VENIT AD PARTES ... MVSA.= 'My Muse with difficulty performs her functions'. _Partes_ in the sense of 'theatrical role' (Ter _Ph_ 27) early acquired the extended sense of 'role', 'function', or 'duty'. Burman cites as parallels _Am_ I viii 87 'seruus et _ad partes_ sollers ancilla parentur' and _Nux_ 68; compare as well _AA_ II 546 'cum, tener, _ad partes_ tu quoque, somne, uenis' and _EP_ III i 41-42 'utque iuuent alii, tu debes uincere amicos, / uxor, et _ad partes_ prima uenire tuas'.
=27. SVMPTAE ... TABELLAE.= Compare _Met_ IX 523-25 'scribit damnatque _tabellas_ ... inque uicem _sumptas_ ponit positasque _resumit_'.
=29. NE DICAM.= I have found no other instance of the expression in verse, but it is common in Cicero (Kühner-Stegmann II i 825).
=30. NVMERIS NECTERE VERBA.= 'Bind words to metre'. I take _numeris_ as a dative; no close parallel presents itself, but compare _Aen_ IV 239-40 'pedibus talaria nectit / aurea'.
=33. NVMEROSOS ... GESTVS.= Compare _Am_ II iv 29 'illa placet _gestu numerosaque bracchia_ ducit', _AA_ II 305 '_bracchia_ saltantis, uocem mirare canentis', and Prop II xxii 5-6 'siue aliquis molli diducit candida _gestu_ / bracchia, seu uarios incinit ore modos'. Heinsius thought GRESSVS (_I1PF3ul_) possible as well, citing Varro _LL_ IX 5 '_pedes_ male _ponere_ atque imitari uatias ['bow-legged men'] coeperit', Martianus Capella IX 909 'licet pulchris rosea numeris ac libratis _passibus_ moueretur', and Maximianus (6th century) _El_ III 27 'suspensos ponere _gressus_'. But the strong manuscript authority for _gestus_ and the parallels in Ovid mark it as clearly preferable to _gressus_.
=33. PONERE.= The verb seems strange, but Burman cited in its support Val Max VIII vii 7 'Roscius ... nullum umquam spectante populo _gestum_, nisi quem domi meditatus fuerat, _ponere_ [_codd_: promere _E. Schulze_] ausus est'.
=35-36. LAVDATAQVE VIRTVS / CRESCIT.= For this commonplace of ancient literature see _Otto_ _ars_ 3 and compare _RA_ 393 'nam iuuat et studium famae mihi creuit honore', _Tr_ V xii 37-38 'denique non paruas animo dat gloria uires, / et fecunda facit pectora laudis amor', _EP_ III ix 21 'scribentem iuuat ipse fauor minuitque laborem', Prop IV x 3, and Cic _Tusc_ I 4.