. 
J.D. Hooker, Introductory Essay to the Flora of Tasmania. 3 
that such problems as those of the relations of Floras and the 
origin and distribution of organic forms will ever be solved, 
though we must eventuall 
the solutions we propose. ‘The limits of the majority of species 
are so undefinable that few naturalists are agreed upon them ;* 
the progress 
of systematic science being, in short, obviously unfavorable to 
i i or char- 
n the 
* The most conspicuous evidence ofthis lies in the fact, that the number of 
known species of ewido plants is oF some assumed to be under 80,000, and by 
others over 150,000. : 
