MAY 23 1930 
PREFACE. 
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The following Treatise, which first appeared in 
the Encyclopaedia Edinensis, now publishing un- 
der the superintendance of the Author, was for- 
tunate in meeting with the approbation of seve- 
ral excellent practical BotanistSj who thought 
that, in a separate form, it might be a useful ap- 
pendage to the stock of Botanical literature, and 
might prove a valuable help to those whose time 
or avocations preclude them from the perusal of 
larger works.. 
In the selection of examples for the illustra- 
tion of the classification, the preference has been 
given to such native plants as are most common 
and most accessible, and to such exotics as are 
the most usual ornaments of the garden, the green- 
house, or parlour ; some are introduced as remark- 
