PREP ACE. Vll 



review. As an illustration of my meaning, I may mention 

 that, in by far the greater number of cases, when only a 

 single species of a genus is to be found in one part of the 

 globe, others are to be met with elsewhere : this is the 

 case with the genera Garrulus, JPica^ Nucifraga^ and 

 'PyrrJiocorax^ of each of which only a single species 

 occurs in Britain, while there are others in India or 

 Africa. So it is with the Australian birds, many of the 

 forms, of which only a single species is found in that 

 country, being also existent in New Guinea and the 

 neighbouring islands. In many instances the remarks 

 on the various genera contained in the Handbook 

 wiU be found to comprise references to these additional 

 species. 



The frequent repetition of the late Mr. Gilbert's name 

 renders it necessary for me to state that he accompanied 

 me to Australia, and diligently sought materials and 

 information in behalf of my work, in those parts of the 

 country which I was unable to visit myself, until I lost 

 an able coadjutor, and science a devoted follower, by his 

 premature death at the hands of the treacherous natives 

 during Leichardt's expedition to Port Essington — a fate 

 which also befell Strange, whose name likewise fre- 

 quently occurs. 



I would wish to remind the reader that many of the 

 passages detailing the occurrence of certain species have 



