At all events, a few months afterwards we find the old relations re-established; ii. 3, 3, 'Vix unum potes, infelix, requiescere mensem, et turpis de te iam liber alter erit.' _Book_ ii.--Cynthia is the theme of nearly all the thirty-four poems of Book ii., which give lively expression to her lover's varying moods. Only three Elegies (1, 10, and 31) are given to other subjects. Of the few poems to which dates can be assigned, the earliest is _El._ 31 (on the dedication of the temple of the Palatine Apollo, B.C. 28), and the latest is _El._ 10, to Augustus (written shortly before the invasion of Arabia by Aelius Gallus in B.C. 24. Cf. l. 16, 'et domus intactae te tremit Arabiae'). The Book was therefore published B.C. 24 at the earliest. _Book_ iii.--In this Book the poems on Cynthia form a far smaller proportion; 7, 12, and 22 show the warmth of the poet's friendship; events of national interest are treated in 4, 11, and 18. In 5, 23-47, Propertius looks forward to spending his later years in the study of natural science ('naturae perdiscere mores,' l. 25). There are few hints of the date of any of the poems in iii. _El._ 20 is apparently as early as B.C. 28; 18 certainly belongs to B.C. 23; 4 perhaps refers to the expedition against the Parthians planned in B.C. 22. The last-mentioned year is the earliest possible date of publication. _Book_ iv., in which there is no principle of arrangement, probably appeared after the author's death. His archaeological tastes come out in four Elegies written, in imitation of the Αἴτια of Callimachus, on Roman antiquities--_El._ 2 on Vertumnus, 4 on Tarpeia, 9 on Cacus, 10 on Jupiter Feretrius. In this way Propertius fulfilled his promise to Maecenas, iii. 9, 49, 'Celsaque Romanis decerpta Palatia tauris ordiar et caeso moenia firma Remo, eductosque pares silvestri ex ubere reges, crescet et ingenium sub tua iussa meum.' _El._ 7 and 8 relate to Cynthia; in 7 her ghost appears to the poet. _El._ 3, a letter from Arethusa to Lycotas, possibly suggested to Ovid the plan of his _Heroides_, just as the antiquarian poems already mentioned may have suggested the _Fasti_. The Book ends with a lament for Cornelia, daughter of Scribonia, Augustus' first wife (_El._ 11). The date of 6 and 11 is certainly not earlier than B.C. 16, while 8 seems to have been written before the rupture with Cynthia. The antiquarian poems are considered by some to have been among Propertius' earliest efforts. Propertius was familiar with the whole range of Greek poetry--Homer (iii. 1, 25-34), Mimnermus (i. 9, 11), Pindar (iii. 17, 40), the dramatists, Theocritus, and Apollonius Rhodius. As his models he names especially the Alexandrians Callimachus and Philetas, whom he claims to follow more closely than any of his predecessors; iii. 1, 1,