Philadelphia: Gillin, M'Guigan & White, Steam-Power Printers, 125 North Seventh Street, [1874]. First separate edition. 23 cm. 31 pp., one in text illustration. Original printed wrappers (corner chip). Not in Randers-Pehrson and Renstrom. Offprint from the Journal of the Franklin Institute for July, August & September 1874. Scarce. More