These experiments appear incontrovertible in support of his theory, which is, "that the wire gauze is merely the rapid receiver and the retainer of heat, and that it is the caloric in its meshes which prevents the flame of the lamp from being fed by the oxygen of the atmosphere on the outside.

I appeal to facts as incontrovertible as the phenomena of the heavens.

On the other hand the time and place for insistence must be wisely selected, and any claim made must be incontrovertible on the score of justice and practicability.