The O.E.D. quotes the first sentence of this passage to illustrate its first sense of the word--'the "fifth essence" of ancient and mediaeval philosophy, supposed to be the substance of which the heavenly bodies were composed, and to be actually latent in all things, the extraction of it ... being one of the great objects of Alchemy.' But Paracelsus expressly denies 'that the quintessence exists as a fifth element beyond the other four'; and as he goes on to discuss the different quintessences of different things (each thing having in its constitution the four elements, though one may be predominant) it would seem that he is using the word rather in the second sense given in the O.E.D.--'The most essential part of any substance, extracted by natural or artificial processes.' Probably the two meanings ran into each other. There was a real and an ideal quintessence of things. A specific sense given to the word in older Chemistry is a definite alcoholic tincture obtained by digestion at a gentle heat. This is probably the 'soule of simples' (p. 186, l. 26), unless that also is the quintessence in Paracelsus's full sense of the word. ll. 17-20. _As, in the firmament, Starres by the Sunne are not inlarg'd, but showne. Gentle love deeds, as blossomes on a bough, From loves awakened root do bud out now_. _P_ reads here: As in the firmament Starres by the sunne are not enlarg'd but showne Greater; Loves deeds, &c. This certainly makes the verse clearer. As it stands l. 18 is rather an enigma. The stars are not revealed by the sun, but hidden. Grosart's note is equally enigmatical: 'a curious phrase meaning that the stars that show in daylight are not enlarged, but showne to be brighter than their invisible neighbours, and to be comparatively brighter than they appear to be when all are seen together in the darkness of the night.' _P_ is so carelessly written that an occasional good reading may be an old one because there is no evidence of any editing. The copyist seems to have written on without paying any attention to the sense of what he set down. Still, 'Gentle' is the reading of all the other MSS. and editions, and I do not think it is necessary or desirable to change it. But _P_'s emendation shows what Donne meant. By 'showne' he does not mean 'revealed'--an adjectival predicate 'larger' or 'greater' must be supplied from the verb 'enlarg'd'. 'The stars at sunrise are not really made larger, but they are made to seem larger.' It is a characteristically elliptical and careless wording of a characteristically acute and vivid image. Mr. Wells has used the same phenomenon with effect: 'He peered upwards. "Look!" he said. "What?" I asked. "In the sky. Already. On the blackness--a little touch of blue. See! _The stars seem larger._ And the little ones and all those dim nebulosities we saw in empty space--they are hidden."