Spenser-Sidney scholarship has for some time been concerned with the problem of the sources of the Mutabilitie Cantos, of the Garden of Adonis passage in the Faerie Queene, and of the Pamela-Cecropia episode in the third book of the Arcadia, with reference to their expression of natural philosophy. Miss Albright, Miss Wilson somewhat briefly, Miss Whitney, Mr. Harrison, and Mr. Levinson have rejected as vaguely remote, or have tried to break down completely, the theory of definite influence of Lucretius. These scholars have, in effect, built up a kind of vari-colored stone wall against Lucretius and against all the emphasis of Mr. Greenlaw's careful researches, tip-toeing around the wall to Empedocles by way of Du Plessis Mornay, and then coming back again to Cicero in his De Natura Deorum, or to Ovid, or, finally substantially neutralizing the whole exhibit by the neutral-toned tendency to fall back upon the theory of general Renaissance culture and commonplaces as the only determinative source of influence. Must we, however, leave the problem at this point? Or is there a very definite, direct source?