Jacques Loeb - The mechanistic conception of life (1912)

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Since Pawlow [Pavlov] and his pupils have succeeded in causing the secretion of saliva in the dog by means of optic and acoustic signals, it no longer seems strange to us that what the philosopher terms an 'idea' is a process which can cause chemical changes in the body.

Jacques Loeb

For the metaphysical term 'will' we may in these instances safely substitute the chemical term 'photochemical action of light.'

Jacques Loeb

Nothing indicates, however, at present that the artificial production of living matter is beyond the possibilities of science...

Jacques Loeb