Herakleitus conceived the sun and stars, not as solid bodies, but as meteoric aggregations perpetually dissipated and perpetually renewed or fed, by exhalation upward from the water and earth. The sun became extinguished and rekindled in suitable measure and proportion, under the watch of the Erinnyes, the satellites of Justice. These celestial lights were contained in troughs, the open side of which was turned towards our vision. In case of eclipses the trough was for the time reversed, so that the dark side was turned towards us; and the different phases of the moon were occasioned by the gradual turning round of the trough in which her light was contained. Of the phenomena of thunder and lightning also, Herakleitus offered some explanation, referring them to aggregations and conflagrations of the clouds, and violent currents of winds.[93] Another hypothesis was often ascribed to Herakleitus, and was really embraced by several of the Stoics in later times--that there would come a time when all existing things would be destroyed by fire ([Greek: e)kpu/rôsis]), and afterwards again brought into reality in a fresh series of changes. But this hypothesis appears to have been conceived by him metaphysically rather than physically. Fire was not intended to designate the physical process of combustion, but was a symbolical phrase for the universal process; the perpetual agency of conjoint destruction and renovation, manifesting itself in the putting forth and re-absorption of particulars, and having no other reality except as immanent in these particulars.[94] The determinate Kosmos of the present moment is perpetually destroyed, passing into fire or the indeterminate: it is perpetually renovated or passes out of fire into water, earth--out of the indeterminate, into the various determinate modifications. At the same time, though Herakleitus seems to have mainly employed these symbols for the purpose of signifying or typifying a metaphysical conception, yet there was no clear apprehension, even in his own mind, of this generality, apart from all symbols: so that the illustration came to count as a physical fact by itself, and has been so understood by many.[95] The line between what he meant as the ideal or metaphysical process, and the elementary or physical process, is not easy to draw, in the fragments which now remain. [Footnote 93: Aristot. Meteorol. ii. e. p. 355, a. Plato, Republ. vi. p. 498, c. 11; Plutarch, De Exilio, c. 11, p. 604 A.; Plutarch. De Isid. et Osirid. c. 48, p. 370, E.; Diogen. L. ix. 10; Plutarch, Placit. Philos. ii. 17-22-24-28, p. 889-891; Stobæus, Eclog. Phys. i. p. 594. About the doctrine of the Stoics, built in part upon this of Herakleitus, see Cicero, Natur. Deor. ii. 46; Seneca, Quæst. Natur. ii. 5, vi. 16.] [Footnote 94: Aristot. or Pseudo-Aristot., De Mundo, [Greek: e)k pa/ntôn e(\n kai\ e)x e(no\s pa/nta].] [Footnote 95: See Lassalle, Herakleitos, vol. ii. s. 26-27, p. 182-258.