Observations on arctic sea-water and ice

Abstract In order that observations on the specific gravity of sea-water should be made in the Arctic Expedition of 1875, by the method successfully used on board Her Majesty’s ship “Challenger,” Sir George Hares, when he left that ship to take command of the expe­dition, brought with him one of Mr. Buchanan’s hydrometers. Professor Hartley superintended the construction of its graduated weights, and suggested the supply of apparatus for the volumetric estimation of chlorine; and, on the departure of the expedition, both sets of observations were allotted to me.