THE ALDEK, 



217 



previously of tolerably sound and dry quality) soft and 

 spongy, and in time convert it into a decided bog." J 



The wood of the Alder is soft and light, and if exposed 

 alternately to wet and dry, will scarcely last a year ; but if 

 kept entirely submersed or buried in damp earth, no wood 



LEAVES OF THE ALDER. 



is more durable. Hence it is extensively used for founda- 

 tions of bridges, water-pipes, pumps, &c. 



By lying for a long time in peat bogs, it acquires a black 



hue, but from its softness will not take a good polish. 



The young branches are much used for the purpose of 



filling in drains, and are more durable than any other kind 



of brushwood. Sir T. D. Lauder says that the wood is 



1 Sclby. 



L 



