"August 22nd, 1914.A planing machine platen, for instance, moves at a uniform rate of speed each way, and by its own motion shifts or reverses the driving power at each extreme of the stroke. Presuming that there were no examples to be examined, an apprentice would find many easier problems to explain than how a planing machine can shift its own belts. If a platen or table disengages the power that is moving it, the platen stops; if the momentum carries it enough farther to engage or connect other mechanism to drive the platen in the opposite direction, the moment such mechanism comes into gear the platen must stop, and no movement can take place to completely engage clutches or shift belts. This is a curious problem that will be referred to again.
Be this as it may, Spinoza takes up the Aristotelian identification of logical with dynamical connexion, and gives it the widest possible development. For the Stagirite would not, at any rate, have dreamed of attributing any but a subjective existence to the demonstrative series, nor of extending it beyond the limits of our actual knowledge. Spinoza, on the other hand, assumes that the whole infinite chain of material causes is represented by a corresponding chain of eternal ideas; and this chain he calls the infinite intellect of God.566 Here, besides the necessities of systematisation, the411 influence of mediaeval realism is plainly evident. For, when the absolute self-existence of Platos Ideas had been surrendered in deference to Aristotles criticism, a home was still found for them by Plotinus in the eternal Nous, and by the Christian Schoolmen in the mind of God; nor did such a belief present any difficulties so long as the divine personality was respected. The pantheism of Spinoza, however, was absolute, and excluded the notion of any but a finite subjectivity. Thus the infinite intellect of God is an unsupported chain of ideas recalling the theory at one time imagined by Plato.567 Or its existence may be merely what Aristotle would have called potential; in other words, Spinoza may mean that reasons will go on evolving themselves so long as we choose to study the dialectic of existence, always in strict parallelism with the natural series of material movements constituting the external universe; and just as this is determined through all its parts by the totality of extension, or of all matter (whether moving or motionless) taken together, so also at the summit of the logical series stands the idea of God, from whose definition the demonstration of every lesser idea necessarily follows. It is true that in a chain of connected energies the antecedent, as such, must be always precisely equal to the consequent; but, apparently, this difficulty did not present itself to Spinoza, nor need we be surprised at this; for Kant, coming a century later, was still so imbued with Aristotelian traditions as, similarly, to derive the category of Cause and Effect from the relation between Reason and Consequent in hypothetical propositions.568How far Plotinus was indebted to Ammonius Saccas for his speculative ideas is another question with respect to which the Pythagoreanising tendencies of his biographer may282 possibly have contributed to the diffusion of a serious misconception. What Porphyry tells us is this. Before leaving Alexandria, Plotinus had bound himself by a mutual agreement with two of his fellow-pupils, Herennius and Origines (not the Christian Father, but a pagan philosopher of the same age and name), to keep secret what they had learned by listening to the lectures of Ammonius. Herennius, however, soon broke the compact, and Origines followed his example. Plotinus then considered that the engagement was at an end, and used the results of his studies under Ammonius as the basis of his conversational lectures in Rome, the substance of which, we are left to suppose, was subsequently embodied in his published writings. But, as Zeller has pointed out, this whole story bears a suspicious resemblance to what is related of the early Pythagorean school. There also the doctrines of the master were regarded by his disciples as a mystery which they pledged themselves to keep secret, and were only divulged through the infidelity of one among their number, Philolaus. And the same critic proves by a careful examination of what are known to have been the opinions of Origines and Longinus, both fellow-pupils of Plotinus, that they differed from him on some points of essential importance to his system. We cannot, therefore, suppose that these points were included in the teaching of their common master, Ammonius.425 But if this be so, it follows that Plotinus was the real founder of the Neo-Platonic school; and, in all cases, his writings remain the great source whence our knowledge of its first principles is derived.Jeff! Look Wildly Sandy gesticulated.But neither when he left the darkling womb,"Who are you?""I have been robbed!" he cried, "robbed of those diamonds! Ah, tell me what is this new trick you have played on me! Help! Help!"
