[E]nergy is conserved, or is indestructible. This form of speech might be applied to other cases of alternate immortality, where one of two things comes into existence on disappearance of the other.
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"Energy and Force" (Mar 28, 1873) A previously unpublished lecture by Prof. Clifford before members of the Royal Institution, as described in Nature (May-Oct, 1880) Vol. 22, pp. 122-124. with an introduction by J. F. Moulton.