EUCALYPTUS TREES. 105 
ant may learn to discriminate at once with exactness 
between the different timber-trees, the grasses, the 
plants worthy of ornamental culture, or any others 
possessing industrial or cultural interest. The saw- 
yer, as well as the trader in timber, may learn how 
many of the one hundred and forty Australian Eu- 
calypts occur within his reach—how phytography 
designates each of them by a specific appellation ac- 
knowledged all over the globe. Phytologic inquiry, 
aided by collateral sciences, will disclose to him before- 
hand the rules for obtaining the wood at the best sea- 
sons, for selecting it for special purposes, for securing 
the best preservation. Phyto-chemistry will explain 
to him what average percentage of potash, oils, tar, 
vinegar, alcohol, tannic acid, ete., may be obtained 
under ordinary circumstances from each. He will 
_understand, for instance, that the so-called Red Gum- 
tree of Victoria, the one so famed for the durability 
of its wood and for the peculiar medicinal astringency 
of its gum-resin, is widely different from the tree of 
that vernacular named in Western Australia ; that it 
is wanting in Tasmania, yet that it has an extensive 
geographic range over the interior of our continent ; 
and that thus the experiences gained on the products 
of this particular species of tree by himself or others 
are widely applicable elsewhere. Through collections 
of these kinds the thoughtful colonist may have his 
attention directed to vegetable objects of great value 
in his own locality, of the existence of which he 
might otherwise not readily become aware. New 
trades may spring up, new exports may be initiated, 
new local factories be established. Phytographic 
works on Australian plants, now extant in many vyol- 
