2 ADVERTISEMENT. 



treat of the Vertebrata, on the same plan, and complete the 

 subject. 



I should not be doing justice to my own feelings did I not 

 avail myself of the present opportunity of expressing the deep 

 sense of gratitude I feel towards Professor Owen as well for 

 this as for the many other favours I have received at his hands 

 during a period of nearly ten years : and I shall endeavour, to 

 the best of my abilities, to discharge my present undertaking in 

 a manner which may not be unworthy of the importance of the 

 subject. 



WILLIAM WHITE COOPER. 



12. Tenterden Street, 

 Hanover Square. 



