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74 is not until arriving at Sonnet xxii. that he strikes a note worthy of his mature power, and he continues unequal up to about Sonnet lx., when masterpieces begin to occur with frequency; from this point onwards the proportion of absolutely insignificant poems is comparatively small. The interspersed sestines and ballate add little to his reputation; not so the canzoni, which are among his noblest productions. Traces of a chronological arrangement are evident; thus his secession to the Sorga gives birth to a group of sonnets with which those denouncing the Papal Court at Avignon are intimately connected; and in general the poems show a continuous development of style, but there are some signal exceptions. Towards the end of the first book his Muse would seem in danger of flagging, were she not stimulated by forebodings of the death of Laura. The pieces expressing this apprehension form a well-marked group, which may be associated with the doubts and fears which, after Laura's decease, he tells us beset him on his last parting with her (1347):

Mestica, the most critical of Petrarch's editors, seems to think that he wrote no more on Laura in her lifetime after the great spiritual change which he supposes him to have undergone in 1343, when he wrote his dialogue with St. Augustine. We see but slight evidence of any such metamorphosis.