in like manner from tropic to tropic; only that the cosmical motion is spiral simply, whereas the other is likewise sinuous and with much smaller intervals. For this has not escaped me. But the fact is, that the constant and perpetual motion of the sun in the ecliptic without latitude and dragons, which sun nevertheless has a common motion with the other planets in respect of spirals between the tropics, forbids me to agree with this opinion. We must therefore seck other sources both of this and of the three other motions. Such are the ideas with regard to the celestial motions which seem to me to have least inconvenience. Let us see then what they deny and what they affirm. They deny that the earth revolves. They deny that there are two motions in the heavenly bodies, one being from west to east; and affirm a difference in speed, one outstripping and leaving the other behind. They deny an oblique circle with a different position of its poles; and affirm spirals. They deny a separate primum mobile, and carriage by force; and affirm a cosmical consent as the common bond of the system. They affirm that the diurnal motion is found not in the heaven only', but also in the air, water, and even the exterior of the earth, in respect of its verticity. They affirm that this cosmical motion of flowing and rolling in fluids, becomes verticity and direction in solids, until it passes into pure immobility. They deny that the stars are fixed like knots in a board. They deny that eccentrics, epicycles, and such structures are real. They affirm that the magnetic motion, or that which brings bodies together, is active in the stars, whereby fire evokes and raises fire. They affirm that in the planetary heavens the bodies of the planets move and revolve with greater velocity than the rest of the heaven in which they are situated, which does indeed revolve but more slowly. They affirm that from this inequality come the fluctuations, waves, and reciprocations of the planetary ether, and from them a variety of motions. They affirm a necessity in the planets of revolving faster and slower, according they are situated high or low in the heaven, and that by consent of the universe. But at the same time they affirm a dislike in the planets of preternatural velocity as well of the greater as of the lesser circle. They affirm a tendency to Motum diurnum inveniri non in cœlo, sed et in aëre, aquis, etiam extimis terræ, quoad verticitatem. So the sentence stands in the original. But it seems that tantum or some equivalent word has dropped out. J. S. follow the sun, by reason of neediness of nature, in the weaker fires of Venus and Mercury; the rather, because Galileo has discovered certain small wandering stars attendant upon Jupiter. These then are the things I see, standing as I do on the threshold of natural history and philosophy; and it may be that the deeper any man has gone into natural history the more he will approve them. Nevertheless I repeat once more that I do not mean to bind myself to these; for in them as in other things I am certain of my way, but not certain of my position. Meanwhile, I have introduced them by way of interlude, lest it be thought that it is from vacillation of judgment or inability to affirm that I prefer negative questions. I will preserve therefore, even as the heavenly bodies themselves do (since it is of them I am discoursing), a variable constancy. INDEX TO THE PHILOSOPHICAL WORKS. Note. -The parts of the Index printed in Italic refer to the Editors' Prefaces and Notes. Abecedarium naturæ, primumque in operibus Divinis tirocinium, i. 461, 565, 566; naturarum abstractarum, ii. 17. Abel, an image of the contemplative state, iii. pastor, imago vitæ contemplativæ, i. 465. Abietis lignum minime densum, ii. 248, 249. Abridgements of learning condemned, iv. 494. servandum, interdum mutandum, i. 490. of the Platonists, iv. 69, 75. Acceleration, ii. 442-448. of falling bodies, i. 625. of the clarification of liquors, i. 442-446. of putrefaction, ii, 451-453. See Putre- of birth, two causes of, ii. 457, 458. early ripening of the embryo, ii. 457. plenty of nourishment, ii. 458. of germination. See Germination. Aceti aspersione turbinem compesci, ii. 50. his theory of tides, iii. 45, 46. his statements as to the winds in the Acoustics. See Sound. Acroamatic method of discourse, iv. 450. theatralis in dicendo, i. 711. Action and contemplation, conjunction of, i. Actium, battle of, v. 86. Active good, pre-eminence of, iii. 424. difference between public good and, iii. life, why to be preferred, iii. 422. virtutes magnetis non impedit, ii. 312. proles raritatis, i. 285. Adrian, iii. 304. Adrianus imperator, i. 472. Adulatio, antitheta de eâ, i. 703. Advancement of Learning, preface to, i. Advancement of Learning-continued. date of, i. 415. original design of, i. 415, 416, 418. to, deficient, iii. 455. the doctrine of, v. 57, 78. Ægyptii brutorum effigies in templis cur posue- Enigmatica dicendi methodus, i. 665. Aer corpora naturalia multum turbat, i. 350. aditus ejus, cur prohibendus, i. 351. dupliciter innuit, ii. 175, 220. per clausuram meatuum, ii. 176. mutatio ejus in peregrinando bona, tanquam res indigens omnia avide arripit, per calorem dilatatur simpliciter, ii. 267, humiditatem terræ deprædatur et in se rarefaction is quantæ capax, ii. 283. dilatatus figi potest ut se restituere non ipse in aquam in regionibus supernis ver- versio aeris in aquam optativa, ii. 604. opera ejus in Universitate rerum, ib. impulsu densatus frigidior, iii. 701. per respirationem receptus, iii. 704. See Esculapius, god of healing, iv. 379, 381. and Circe, fable of, iii. 371. Esop, fable of the Frogs and the Well, iv. of the Fox and Cat, iv. 471. fabula de Vulpe et Fele, i. 687. Etas instar ignis lambentis, ii. 304. de decursu ætatis, historia conscribenda, Eternitas materiæ, iii. 110. terræ, iii. 749, 750. ex rationibus motus non probanda, iii. 750. ethnicâ jactantiâ, cœlo soli attributa, iii. 756. scripturis sacris, terræ et cœlo ex æquo, ib. Ether purum et immutabile, iii. 751. Ethera sive spatia cœli interstellaria, iii. an unus perpetuus fluor, iii. 744. Aetites, or eagle stone, ii. 401. Affability, Cicero's commendation of, iii. 446. antitheses for and against, iv. 486. Affections controlled by eloquence, iii. 410. poets and historians, the best doctors of their relation to reason, iv. 457. and perturbations of the mind, v. 23. neglected by Aristotle in his Ethics, ib. loco morborum animi sunt, i. 735. "Africa semper aliquid monstri parit," why, Agaric, a purge, ii. 514, 537, 555. Age, its course, a history thereof proposed, iv. in body, v. 318, 319. in mind, v. 319, 320. Agesilaus de Pharnabazo, i. 445. Agility has two parts, strength and swiftness, Agricola, the German Pliny, works of, i. 572. Agrippa, Cornelius, trivialis scurra, iii. 536. transmutation of, into water, ii. 348, 349, |