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. 
