PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 69 
plains and foothills, on the sides of low mountains, and in the warm, 
dry interior valleys. It will make some growth in the poor soil of 
hillsides, but prefers a fairly fertile soil. In Australia, according to ‘ 
Mr. Howitt and Mr. Maiden, it grows on both lowlands and highlands. 
Uses.—The timber of the Yellow Box is very hard, tough, and dur- 
able, but is difficult to work and is not easily split. It is used in 
Australia for spokes, rollers, heavy. framework, naves, and cogs. 
It is durable underground, and is consequently useful for telegraph 
poles and fence posts. It also makes an excellent fuel. On account 
of its profuse, fragrant bloom, it is coming to be highly prized as a 
source of honey. 
Eucalyptus microtheca. 
CooLiBaH. 
Characteristics.—The Coolibah is a tree of medium size, generally  ° 
more or less crooked, but of quite a pleasing appearance. ‘The usual 
height in Australia is 50 to 80 feet and the diameter 2 to 4 feet. The 
few growing in America have quite erect trunks and give promise of 
becoming fair-sized trees. (Pl. XXXII.) It is one of the largest trees 
of the interior desert regions of Australia. The bark of the trunk is 
rough, generally furrowed, commonly persistent, and of a brownish- 
gray color (see Pl. LXVIII); that of the branches, white and decidu- 
ous. The wood is dark red or brown, and excessively hard and inlocked. 
The foliage is rather dense and inclined to droop. The leaves are 
long and somewhat curved, the two sides being equally dull green. 
The flowers are very small, in 3 to 8 flowered clusters, which usually 
_ grow in groups. The seed cases are very small and broadly top- 
shaped, with the valves protruding. 
Climatic requirements.—The tree is indigenous to the dry, hot 
deserts of Australia, doing best in gravelly, well-drained soil. Baron — 
von Mueller says of it, in his Kucalyptographia, that it will ‘‘ brave a 
climatic temperature as torrid and as high as any on our planet, the 
thermometer rising in the shade, in places where this Eucalyptus 
grows, occasionally to 127° F.” In his Select Extra-tropical Plants 
he states that it ‘‘ withstands unscorched a frequent heat of 156° F.” 
It also endures heavy frosts. It has grown well where it has been 
tried in the Southwest. | 
Uses.—As a forest cover for excessively hot, dry regions in the 
Southwest, this tree is quite a promising one. It furnishes a timber 
that is valuable for bridges, railway ties, posts, and for general build- 
ing purposes. On account of the color and markings of the wood 
it is used for cabinetwork to some extent. The roots of this tree are 
used in a novel way by the natives of Australia. In common with a 
few other species of Eucalyptus this tree possesses water-yielding 
