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240 FOREST CULTURE AND 
Quercus palustris, Du Roi.—The Marsh Oak of 
North America. Height eighty feet; of quick 
growth. The wood, though not fine-grained, is 
strong and tough. 
Quercus Prinus, L.—The North American Swamp 
Oak. A tree ninety feet high, available for wet local- 
ities. Foliage deciduous. Wood strong and elastic, 
of fine grain. A red dye is produced from the bark. 
Quercus Robur, L.—The British Oak, extending 
through a great part of Europe and Western Asia, 
attaining a great age and anenormous size. Extreme 
height one hundred and twenty feet. Two varieties 
are distinguished : 1. Quercus sessiliflora, Salisbury. 
The Durmast Oak, with a darker, heavier timber, 
more elastic, less fissile. This tree is also the quick- 
est of the two in growth, and lives on poorer soil. Its 
bark is also richer in medicinal, dyeing and tanning 
principles. 2. Quercus pedunculata, Willd. This 
variety supplies most of the oak-timber in Britain 
for ship-building, and is the best for bending under 
steam. It is also preferred for joiner’s work. 
Quercus rubra, L.—The Red Oak of North Amer- 
ica. Height one hundred feet; diameter of stem 
four feet. The wood is not of value; but the bark is 
rich in tannin. Autumnal tint of foliage beautifully 
red. 
Quercus semecarpifolia, Smith. —In the Himalayas. 
Height of tree often one hundred feet ; girth of stem - 
eighteen feet. It furnishes a first-class timber. 
Quercus serrata, Thunberg.—One of the twenty-. 
three known Japan oaks. It yields the best food for 
the oak silk-worm (Bombyx Yamamai). 
Quercus Sideroxylon, Humboldt. — Mountains of 
