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The following are quotes:
- “In tracing the phenomena of origin, growth, and energies of living things, through all their modifications, the most advanced philosophers of the present day declare that they ultimately arrive at a single source of power, from which all ‘vital energy’ is derived; and the disquieting circumstance is that this source is NOT the direct fiat of a supernatural agent, but a reservoir of what must be regarded as ‘inorganic force’. In short, it is considered as proved that all the energy which we derive from plants and animals is drawn from the sun.”
- (a) Tyndall, John. (1863). “Vitality”, Alps, Summer.
(b) Tyndall, John. (1871). Fragments of Science for Unscientific People (Vitality [with note on Huxley's translation of Descartes], pgs. 410-418). Publisher.
(c) Tyndall, John. (1893). Lectures and Essays by John Tyndall (pgs. 94-96). Watts, 1903.
- Vital energy – Hmolpedia 2020.