In Fleeming Jenkin's PAPERS: LITERARY, SCIENTIFIC, &c, his article on "The Graphic Representation of the Laws of Supply and Demand, and Their Application To Labour", originally published in RECESS STUDIES in 1870, he illustrates the demand and supply curves in diagrams that use the horizontal axis for shillings and the vertical axis for quantities of quarters of wheat in figures 1-9. In the other four figures, prices continue to appear on the abscissae, with quantities on the ordinates. In his "On the Principles Which Regulate the Incidence of Taxes", from the Proceedings of the Royal Society of Edinburgh, Session 1871-2, he continues to use the same convention for prices and quantities in all five figures. Samuel Bostaph