vii; PREFACE. 



met with ; the critics forgetting apparently that these works are an 

 attempt to render scientific subjects popular, and attractive to the 

 general reader. 



In the present edition of " THE OCEAN WOELD " it is only necessary 

 to add to the above (dated January, 1868), that the work has been 

 revised throughout, and some not unimportant errors corrected. For 

 several of these I am indebted to Mr. C. 0. Gr. Napier, who has re- 

 arranged the whole of the Mollusca. Mr. David Grieve has kindly 

 revised and added to the Crustacea ; and to the Messrs. Johnston of 

 Montrose, and Dr. Wilson Johnston of the Bengal service, I am 

 indebted for some valuable practical information respecting the salmon 

 and the various modes of taking it. 



W. S. 0. 



March 1, 1869. 



