Report on deep-sea researches carried on during the months of July, August, and September 1870, in H. M. surveying-ship ‘Porcupine'

[At the time at which this Report was presented, it was hoped that the General Summary of Results, of which it then consisted, could be amplified by the insertion of the requisite details, within the time at which the publication of the Proceedings would be due. It has been found, however, that in working out these details so many new points arose suggestive of further inquiries (especially requiring careful comparison of Temperature observations) that, though devoting to them all the time he could command, the Member of the Expedition who is responsible for the whole, save the Narrative of the First Cruise, has found himself unable to complete his portion of the Report at an earlier date. Whilst expressing his regret for the delay which has hence arisen, he ventures to hope that some compensation for it will be found in the greater completeness which the Report now possesses; especially in that Section of it which treats of the Causal Relation between the double currents of the Straits of Gibraltar and Baltic Sound, and the Generalvertical Oceanic Circulation.— W. B. C.]