At a later day the ethereal element of the stars was distinguished from the four inferior elements not by its Aristotelian name of first element but by that of fifth element, or fifth existence, or fifth "essence." Hence arose and was applied to the fifth element the name "quintessence"; a word which in its turn acquired various meanings. Ten years after Harvey's death Milton published his description of the creation of heaven; a description couched, however, in terms of the uncreated heaven of Aristotle. Milton wrote:-- "And this ethereal quintessence of heaven Flew upward, spirited with various forms, That roll'd orbicular, and turned to stars Numberless, as thou seest, and how they move; Each had his place appointed, each his course; The rest in circuit walls this universe."[336] We may now return from this excursion through the "Cosmos," to bring its light to bear upon those high-sounding words of Aristotle which, according to Harvey, formed the basis of speculations about the innate heat, the spirits, and the blood, which were handed down by "Scaliger, Fernelius, and others," and affected the views of Harvey himself. Aristotle had written:-- "The virtue or potency of every soul[316] seems to be associated with a body[317] other than the so-called elements, and more divine." And a little farther on:-- "For there exists in the semen of all [animals] that which makes their semen generative, the so-called heat. Yet this is not fire, nor any such power, but the spirits[319] included in the semen and in foaminess, and in the spirits the nature which is analogous to the element of the stars."[337] That generative heat which is not elemental fire, but a "body" or "nature" diviner than the lower elements, can be the analogue of nothing else than the celestial ether.