Almost certainly the cost of publication caused the delay, but Bowditch had not put the work on one side after 1818, still continuing to improve it over the succeeding years.
Halos tiyak ang gastos ng publication sanhi ng pagka-antala, ngunit Bowditch ay hindi maglagay ng trabaho sa isang tabi pagkatapos ng 1818, patuloy pa rin ito upang mapabuti sa succeeding years.