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If the body is represented as unity, it must surely be because it is unity, as the old philosophy had held. But how can we reintroduce unity into the body without reintroducing substantial form, and destroying the mechanistical plurality which the new science demanded? It is at this point that Leibniz produces the speculative postulate of his system.

It was forced on Descartes by the requirements of mechanistical science: if the members were simply a plurality of things, they must really be parts of environment; the body which the soul indwelt must be a body; presumably, then, the pineal gland. An untenable compromise, surely, between admitting and denying the reality of the soul's incarnation. What, then, was to be done?

The science was mathematical in its form, mechanistical in its doctrine, and unanswerable in its evidence it got results.

Moreover, the correlation of the unitary soul with the unitary gland might do justice to a mechanistical philosophy, but it did not do justice to the soul's own consciousness of itself. The soul's consciousness is the 'idea' or 'representation' of the life of the whole body, certainly not of the life of the pineal gland nor, as the unreflective nowadays would say, of the brain.