iv PEEPAOE. 



the primary opportunity of making the voyage ; to Com- 

 mander Bullock, of H.M.S. " Serpent," and Captain 

 Courtenay, late of H.M.S. " Scylla," from both of whom 

 I received uniform courtesy and kindness ; to Lieutenant 

 Eichards, and Mr. Sutton (Chief Engineer) of the " Ser- 

 pent," and Lieutenant D. Stewart, of the " Scylla," to 

 each of whom I am indebted for steady and valuable 

 assistance ; to Mr. Jose d 'Ahneida, of Singapore, Messrs. 

 Hugh Low, C. C. De Crespigny, J. Tyndall Woods, and 

 Howard, of Labuan; to Mr. Alfred Houghton, Mr. Mar- 

 tin, and the Tuan Muda of Sarawak ; to Dr. Maxwell, of 

 Ta-kau, and Mr. Gregory, Vice-Consul of Tam-suy, For- 

 mosa ; to the Venerable Archdeacon Gray, Consular Chap- 

 lain, and Dr. J. G. Kerr, of Canton ; and last, though not 

 least, to Mr. F. D. Lalcaca, and (the late) Captain Jameson, 

 of Hong Kong ; — all of whom showed me various acts of 

 kindness, which will not soon be forgotten. 



My thanks are also due to Drs. Baird and Gunther ; to 

 Messrs. G. E. Gray, F. Walker, Frederick Smith, A. G. 

 Butler, and Waterhouse, Junior, of the British Museum ; as 

 well as to Messrs. Albany Hancock, C. Spence Bate, and 

 Professor Oliver ; — all of whom have kindly assisted me in 

 the identification of species. 



It should be mentioned, that the account of the Pratas 

 Island, and the chapter on the Luminosity of the- Sea, 

 were published in the " Quarterly Journal of Science" for 

 1867, and are reprinted with the permission of the Editors, 

 having had the advantage of subsequent revision and en- 

 largement. Other papers have been incorporated from the 

 Proceedings of the Linnsean, Geological, Ethnological, and 

 Eoyal Geographical Societies, as weU as from the Annals of 

 Natural History, &c., in order to give unity to the narrative, 

 and completeness to the Natural History observations. 



Greenwich, 



March, 1868. 



