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3Of these some act mechanically, others organically. The difference between machines and organs is this, that the former are composed of many subordinate parts, or propelled by a great power, as balistæ for instance, and wine-presses; whereas, the latter, by an ingenious application of the moving power, can be set in motion by a single person, as in turning the axis of the scorpion or anisocycli. Thus organs, as well as machines, are extremely useful and necessary, inasmuch as, without them, no works could be carried into execution.
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