B. C. Burt, The Philosophical Review (1892)
“ To exhibit the difference of method and spirit between the philosophy of nature and natural science by means of examples, let us consider the doctrines, say, of the conservation of energy, instead of being merely “given” as a general “fact” or, rather, perhaps, as a postulate, is a self-evident, identical proposition, since energy, and energy alone, is being in activity, energy. ”
