XXV. LEGUMINA‘CEE: ROBI'NIA 235 
382. Robinia Pseid-Acacia. 
Scotch pine. According to Barlow, the strength of acacia timber, as compared 
with fine English oak, is as 1867 to 1672 ; the strength of ash being as 2026 ; 
beech, 1556; elm, 1013; Riga fir, 1108; Norway spar (spruce fir), 1474 ; 
and teak, 2462. The tree has one property almost peculiar to it, that of forming 
heart-wood at a very carly age, viz. in its third year; whereas the sap-wood of the 
oak, the chestnut, the beech, the elm, and most other trees, does not begin to 
change into heart, or perfect, wood, till after 10 or 15 years’ growth. The trees of 
this species, and of several of its varieties, in the garden of the Horticultural So- 
ciety, and in the arboretum of Messrs. Loddiges, have attained the height of 30 ft- 
and upwards, in 10 years from the time they were planted. There is, perhaps, no 
American tree respecting which so much has been said and done, in Europe, as 
the locust. It was one of the first trees that we received from America, and 
it has been more extensively propagated than any other, both in France and Eng- 
land. It has been alternately extolled and neglected in both countries ; and even 
at the present time, though the beauty of its foliage and flowers is generally ac- 
knowledged, and though it has, at different periods, been enthusiastically praised 
by different writers, for the valuable properties of its wood, 1t cannot be con- 
sidered as holding a high rank as a timber tree, or as being worth planting with 
a view to profit. We pass over many curious and historical facts respecting the 
locust tree, for which we refer to the Ist edit. of this work, and come to the 
year 1823, when an extraordinary sensation was excited in Britain respecting 
this tree by Cobbett. This writer, while in America, from 1817 to 1819, “ was 
convinced that nothing in the timber way could be so great a benefit as the 
general cultivation of this tree.” On his return to England he commenced 
nurseryman, and the name of locust, as applied to this tree, being, before 
Cobbett’s time, almost forgotten in England, many persons, in consequence, 
thought it was a new tree. Hence, while quantities of plants of Robinia 
Psetd-Acacia stood unasked for in the nurseries, the locust, which every one 
believed could only be had genuine from Mr. Cobbett, could not be grown by 
him in sufficient quantities to supply the demand. After creating a prodigious 
sensation for a few years, the locust mania entirely subsided, and the tree is 
now, as it was before Cobbett’s time, planted only, or chiefly, for ornament. 
¥ 2. R. visco'sa Vent. The clammy-darked Robinia. 
Identification. Vent. Hort. Cels., t. 4.5 Dec. Prod., 2. p. 262. 5 Don’s Mill., 2. p. 238, 
Synonymes. R. glutindsa Bot. Mag. 560.; R. montana Bartram ; the Rose-flowering Locust. 
mgravings. Vent. Hort. Cels.,t.4.; Bot. Mag., t. 560., as R. glutindsa ; the plate of this tree nm 
Arb. Brit., 1st edit., vol. v.; and our fig. 383. 
Spec. Char., $c. Branches and legumes glandular and clammy. Racemes 
crowded, erect. Bracteas concave, deciduous, each ending in a long bristle, 
