170 FORESTS, WOODS, AND TREES 
and be planted out at the end of the second or third season. 
The timber is valuable when of small dimensions, as heart- 
wood is formed very early ; and on this account the rotation 
may be short, and the trees be felled when 30 or 40 years 
old. The wood is very strong, and is valued for spokes of 
motor wheels. It is easily riven, and when used for posts, 
stakes, and sills, is much more durable than oak in contact 
with the soil. It is now employed in the United States for 
trenails used in fastening planks to sides of ships. Robinia 
suckers freely from the root, and its natural regeneration by 
this means is easy on sandy soil, when rabbits are excluded. 
See Quarterly Journal of Forestry, ii. p. 301 (1908). 
NOTE 
On page 145 Thuya gigantea is said to be free from fungus attacks, 
While these sheets were passing through the press, Dr. G. H. Pethybridge, 
in Quarterly Journal of Forestry, xii. pp. 93-97 (April 1919), has described 
a severe attack of the fungus, Keithia thujina, which recently killed outright 
numerous three-year-old seedlings of Thuya gigantea in a forest nursery in 
(Queen’s County, Ireland. 
Sir E. G. Loder has just written to me (June 1919) that a fine plantation 
of 17,000 trees of this species at Leonardslee, Sussex, have been severely 
affected by this fungus, trees even fifteen feet high being apparently doomed. 
