IX 



unexceptionable, they have been admitted : others 

 are introduced from publications of the first re- 

 spectability, from original drawings, or from 

 those rich repositories of science, the British and 

 Leverian Museums. 



The talents of the engraver to whose care they 

 have been committed are too well known to re- 

 quire particular commendation. 



The remaining volumes will be published in re- 

 gular order, and with as much dispatch as is con- 

 sistent with the accuracy required in a systematic 

 work on Natural History. 



