1 We say “indefinite,” because this virtual sphere in its continuous
expansion wanes away insensibly, and has no definite limiting
surface.
2 That the matter of a primitive element is mathematically unextended
will be rigorously proved in the next following articles.
3 “A Speculation touching Electric Conduction and the Nature of
Matter.” _Philos. Magazine_, 1844, vol. xxiv. p. 136.