Shuckburgh offered the first accurate assessment of the height of Mont Blanc, based on a survey made in August and September of 1775 to which Horace de Saussure also contributed. Shuckburgh reported his findings in two lectures given before the Royal Society of London on the 8th and 15th of May, 1777, and these were printed up in the Society’s Transactions in 1778; the present example is extracted from that year’s volume. The map of the region that illustrates the article includes an accurate outline of some of the peaks including Mont Blanc, on which is indicated the high point of an attempt to reach the summit made by “4 Inhabitants of Chamouny . . . in 1775” shortly before Shuckburgh arrived in the area.