The reason is that in some cases the matter which governs the production in the making and producing of any work of art, and in which a part of the product is present,-some matter is such as to be set in motion by itself and some is not of this nature, and of the former kind some can move itself in the particular way required, while other matter is incapable of this;
Honen arrazoia zera da: Genesiari hasiera ematen dion materia, batzuetan, zerbait artez sortu eta ekoizten denean, eta sortutakoaren zatiren bat bere baitan mantentzen denean, orduan honelako materia, batzuetan berez izaten da mugitzeko gai, beste batzuetan, ez.