344 



Exotic Conifers in Britain. 



to be the case, for in the case of sample tree No. I the form 

 figure works out at — 



Volume 58-93 X 12 X 12 X 12 _ 



Sectional area X height 240*53 X 80 X 12 



while in the case of No. 2 it is 



50-25 X 12 X 12 X 12 _ g 

 I9I-I3 X 83 X 12 



If the less favourable of these form figures, namely, '441, be 

 used to calculate the true timber contents from the mean of 

 the two sample areas, we get — 



295 x 80 x -441 = 10,407 cubic feet 



which is very near what we came to (10,150 cubic feet) by 

 multiplying the volume of the smaller sample tree (50*25 cubic 

 feet), by the assumed number of trees per acre (202). As, 

 however, I believe there are, on an average, 210 trees per acre, 

 the calculation would probably be more correct thus — 



50*25 x 210 = 10,552 cubic feet 



which differs from the result (10,407 cubic feet) got by using 

 the form figure by less than ih per cent. 



These figures show that in the Douglas fir we have a tree 

 of extraordinary value, and although it is a little fastidious 

 both as to soil and climate, there are doubtless large tracts 

 where its cultivation will prove in the highest degree re- 

 munerative. 



Sequoia gigantea, Decais. (Syn. Wdlingtonia gigantea, Lind.) 

 — This tree is perfectly hardy, at the worst being merely slightly 

 browned by cold winds in winter and spring. Few trees grow 

 so well on the high exposed chalk hills in the south of 

 England. It is very extensively planted throughout the whole 

 country. Many well-grown specimens have been raised from 

 cuttings, a form of propagation that seems to interfere little, 

 if at all, with height-growth. At Orton, in the county of 

 Hunts., there is an avenue 700 yards long, containing about 

 300 trees, many of which were raised from cuttings about 1853, 

 and planted out in the autumn of 1859 and the spring of i860. 

 The trees are now 60-80 feet high, and have a girth in 

 many cases of over 10 feet at breast-height : — 



