THE BIRDS OE AUSTRALIA. 
direction the external features indicate. Also more stress must be laid upon 
bird habits in connection with classification than has hitherto been allowed, 
but here still more care must be taken in judging which are adaptive and which 
not. The best way to arrive at such results will be the study of small groups 
by local workers, as instance the relationships of “ Gerygone ” and “ Acanthiza ,” 
in their widest sense, and then the inter-relationship of the species. It may 
prove that the most different superficially are really the most closely allied 
and vice versa. Only detailed study in any connection will assist in elucidating 
such problems. 
I now anticipate by the close of this work, which is now approaching, that 
the nomenclature of Australian birds will cause less trouble to the next generation 
than that of any other country. 
I have once more to thank all those who have contributed notes. 
GREGORY M. MATHEWS. 
Eoijlis Court. 
18 th July , 1922. 
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