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Rh "Quicquid est in effectibus, esse et in causis; ideoque elementa et mundum sentire" ('De Sensu Rerum'); which, with a little expansion, may be translated—"Whatever is in the effects, that is also in the causes. Man's sensations are the effects of the actions of the elements and the world, therefore the elements and the world are endowed with sensations." But I shall say no more at present either about Campanella or Diogenes of Appollonia. I mention the latter merely in connection with Anaximenes, whose disciple he was, and as the fourth and last name in the older Ionic school which it is at all necessary to particularise. Heraclitus was also an Ionian, but he comes later, and is therefore not to be classed with the four of whose names and opinions I have endeavoured to give you some account.

29. Without carrying further our exposition of these systems, and without entering on any detailed criticism of their merits or demerits, I shall just make this concluding remark: that these systems are truly philosophical, in so far as they aim at the attainment of a unity, a universal in all things, and in so far as they are animated and carried forward by the conviction, obscure and inexplicit though that conviction may have been, that the universal in all things is the ultimately real—is the truth for all intelligence; and that they aim at such a unity, and that they are, to a large extent, actuated and inspired by such a conviction, this, I think, is undoubted.