CHAP. IX.] 
TABLES OF DISTRIBUTION. 
179 
distribution have been constructed for the whole of the Mam- 
malia and Birds, they must necessarily contain many errors of 
detail ; but with all their imperfections it is believed they will 
prove very useful to naturalists, to teachers, and to all who take 
an intelligent interest in the wider problems of geography and 
natural history. 
