xii THE VOYAGE OF H.M.S. CHALLENGER. 



The rocks described in this Eeport, it should be stated, do not comprise 

 all the specimens collected during the Expedition ; all those coming from 

 well-known Islands which have been previously described, unless they should 

 have presented special characters, have been omitted. 



With the exception of a volume on Deep-Sea Deposits, which will be 

 issued in March next, and a Summary Volume, which, it is hoped, may 

 be completed in about a year thereafter, the present volume concludes the 

 Official Series of Reports on the Scientific Results of the Challenger 

 Expedition, a complete list of which is herewith appended. 



These Reports have been issued at intervals during the last nine years, 

 whenever ready and without any reference to systematic arrangement, 

 They are bound up in forty-seven large quarto volumes, containing 27,650 

 pages of letterpress, 2662 lithographic and chromo -lithographic plates, 413 

 maps, charts, and diagrams, together with a great many woodcuts. 



I desire now to convey my thanks to the numerous contributors to this 

 great book, as well as to all those who have in any way assisted me in, 

 thus far, carrying on the work connected with the publication of the 

 Scientific Results of the Expedition. 



John Murray. 



Challenger Office, 32 Queen Street, 

 Edinburgh, \lth November 1889. 



