=79-80. VNDA ... VNGVLA GORGONEI QUAM CAVA FECIT EQVI.= Hippocrene, the spring of the Muses, said to have been created by the hoof-beat of Pegasus. Similarly described at _Met_ V 264 'factas pedis ictibus undas', _Fast_ V 7-8 'fontes Aganippidos Hippocrenes, / grata Medusaei signa ... equi' and Persius prol 1 'fonte ... caballino'.
=80. VNGVLA ... CAVA.= Professor J. N. Grant points out to me the possible borrowing from Ennius _Ann_ 439 Vahlen3 'it eques et plausu _caua_ concutit _ungula_ terram'.
=80. GORGONEI ... EQVI.= The same phrase in the same metrical position at _Fast_ III 450 'suspice [_sc_ caelum]: _Gorgonei_ colla uidebis _equi_'. For the birth of Pegasus from the blood of the Gorgon Medusa, see _Met_ IV 784-86,
=81. COMMVNIA SACRA TVERI.= _Sacra_ similarly used of poetry at _Tr_ IV i 87, _Tr_ IV x 19 'at mihi iam puero caelestia _sacra_ placebant', _EP_ II x 17 'sunt tamen inter se _communia sacra_ poetis', and _EP_ III iv 67 'sunt mihi uobiscum _communia sacra_, poetae'. For _tueri_ 'observe, maintain' compare Cic _Tusc_ I 2 'mores et instituta uitae resque domesticas ac familiaris nos profecto et melius _tuemur_ et lautius'.
=82. ISDEM STVDIIS IMPOSVUISSE MANVM.= Similar phrasing at _Tr_ IV i 27-28 'non equidem uellem ... _Pieridum sacris imposuisse manum_'.
=82. IMPOSVISSE= has the sense of the present infinitive, as is shown by _tueri_ in the previous line; compare as well ii 27-28 'uix sumptae Musa tabellae / _imponit_ pigras, paene coacta, _manus_'. For the idiom, see Platnauer 109-12. It is particularly frequent in the latter half of the pentameter, immediately before the disyllable: compare, from many instances, _AA_ III 431-32 '_ire_ solutis / crinibus et fletus non _tenuisse_ decet' and _Tr_ IV viii 5-12 'nunc erat ut posito deberem fine laborum / _uiuere_, me nullo sollicitante metu, / quaeque meae semper placuerunt otia menti / _carpere_ et in studiis molliter _esse_ meis, / et paruam _celebrare_ domum ueteresque Penates ... inque sinu dominae carisque sodalibus inque / securus patria _consenuisse_ mea'. The idiom, although more common in elegiac verse, is also found in epic: compare _Aen_ X 14 'tum _certare_ odiis, tum res _rapuisse_ licebit'.