Indeterminacy2

Some people try to introduce a volitional principle into nature at this point, but this is falsely to assume that the volitional principle is absent elsewhere -- an assumption purely speculative, and which seems entirely unwarranted. It is not that the universe is divided into a mechanical section and a volitional section, arbitrarily separated by a hypothetical boundary that varies according to our progress in investigation. The mechanical interpretation therefore is a device adopted for practical purposes on the physical plane, which enables us to predict results within limits that do not bring the validity of its assumptions into question. Science finds that one form of motion is consequent upon another, but it knows nothing about the cause of motion; and words like force and mass are merely convenient abstractions. Hence there can be no reason for introducing a psychological element into nature at one point rather than at another, for such disjunct compartments do not exist in nature.
Indeterminacy, as used by science, is the contrary of determinism; both would seem to imply attitudes of mind rather than actualities in nature.