His experiments were numerous and accurate and made upon a variety of substances; having obtained the gas from wood, peat, different kinds of coal, oil, wax, &c. he quantified the intensity of the light from each source.
Sus experimentos fueron numerosos y precisos, y realizado en una variedad de sustancias, que hayan obtenido el gas de la madera, turba, los diferentes tipos de carbón, aceite, cera, etc.