I. — Report on Researches into the Composition of Ocean-Water, collected by H.M.S. 
Challenger, during the years 1873-1876. 
By Prof. William Dittmar, F.R.S. 
(. Received January 1884.) 
II. — Report on the Specific Gravity of Samples of Ocean-Water, observed on board 
H.M.S. Challenger, during the years 1873-1876. 
By J. Y. Buchanan, Esq., M.A., F.R.S.E. 
(. Received January 1884.) 
III. — Report on the Deep-Sea Temperature Observations of Ocean- Water, taken 
by the Officers of the Expedition, during the years 1873-1876. 
