Harding preferred, therefore, to manufacture pyroxyle, that is to say gun-cotton, a substance in which cotton is not indispensable, as the elementary tissue of vegetables may be used, and this is found in an almost pure state, not only in cotton, but in the textile fiber of hemp and flax, in paper, the pith of the elder, etc.
Cyrus Smith préféra donc fabriquer du pyroxyle, c'est-à-dire du fulmi-coton, substance dans laquelle le coton n'est pas indispensable, car il n'y entre que comme cellulose.