The Allen trials [electronic resource] : namely, Allen versus Hunter, Warner versus Griffen, Jobson versus Allen, and Jobson against Sickles (impending,) : with instructions and the various scientific recipes, (European and American,) for making "Continuous gum," without either patent or risk of infringement and an appendix, illustrative of Mr. Daniel E. Sickles' professional morality / by D. Wemyss Jobson.