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THREE:If the necessity of the One is proved by the inward differentiation of what seemed most simple, it is also proved by the integration of what seems most divided. In his next essay, our philosopher wanders off from the investigation of what he has just begun, by abruptly starting the question whether all souls are one.460 This question is, however, most intimately connected with his main theme. He answers it in the affirmative. Strictly personal as our feelings seem, we are, in reality, one with each other, through our joint participation in the world-soul. Love and sympathy among human beings are solely due to this connexion. Plotinus mentions, as another evidence of its reality, the secret affinities called into play even at a great distance by magical spells��an allusion very characteristic of his age.461 What prevents us from more fully perceiving the unity of all souls is the separateness of the bodies with which they are associated. Matter is the principle of individuation. But even within the soul there is a division between the rational and the irrational part, concentration being the characteristic of the one and dispersion of the other. The latter is fitted by its divided nature for presiding over the bodily functions of sensation and nutrition; and with the dissolution of the body it returns to the unity of the higher soul. There are two ways in which we can account for this pervading unity. It is either as products or as portions of the universal soul that all particular souls are one. Plotinus combines both explanations. The world-soul first gives birth to an image of itself, and then this310 is subdivided into as many partial souls as there are bodies requiring animation.Inherent or cooling strains in castings is much more intricate than shrinkage: it is, in fact, one of the most uncertain and obscure matters that pattern-makers and moulders have to contend with. Inherent strains may weaken castings, or cause them to break while cooling, or sometimes even after they are finished; and in many kinds of works such strains must be carefully guarded against, both in the preparation of designs and the arrangement of patterns, especially for wheels and pulleys with spokes, and for struts or braces with both ends fixed. The main difficulty resulting from cooling strains, however, is that of castings being warped and sprung; this difficulty is continually present in the foundry and machine-shop, and there is perhaps no problem in the whole range of mechanical manipulation of which there exists more diversity of opinion and practice than of means to prevent the springing of castings. This being the case, an apprentice can hardly hope for much information here. There is no doubt of springing and strains in castings being the result of constant causes that might be fully understood if it were not for the ever-changing conditions which exist in casting, both as to the form of pieces, the temperature and quality of metal, mode of cooling, and so on.

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THREE:

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