Basel: Buchdruckerei G. A. Bonfantini, 1870. Wraps. 4to. Stab bound beige paper wrappers with black title to front wrapper. Minor browning and foxing to wrappers as well as chipping to the edges. Crease down the middle. Chipping to corners of pages. Text is clean and bright.19 pages + 2 diagrams. Science and technology. SCI/042408. Very Good + in Wraps.