Vlll ADVERTISEMENT. 



Oliver Lang, of Her Majesty's Dock-yard, Woolwich ; Mr. Fincham, of 

 Her Majesty's Dock-yard, Sheerness ; and Mr. Ditchburn, of Limehouse ; 

 for the able scientific descriptions which accompany these subjects. 



It is due to the eminent individuals who have mainly assisted the 

 undertaking, to state that the Publisher and Editor are most grateful 

 to those whose names appear in the work as contributors, as well as 

 to others for many valuable communications and services. 



Mr. Weale, the Publisher and Proprietor of the work, has, for 

 nearly two years, held in communication some of the most scientific 

 men in this and other countries, for the purpose of obtaining the most 

 extensive and valuable information; and it will at once be observed, 

 that no expense has been spared, and that neither taste nor skill has 

 been wanting in the getting up of the volumes, to make the present 

 a splendid national work. The Editor, however, cannot presume to 

 suppose that he has similarly succeeded in the execution of his task; 

 and he will, at all times, through the Publisher, be most thankful to 

 receive and acknowledge any suggestion or amendment. 



