Probably the most successful result from a plantation of pure spruce in Scotland was that obtained on the estate of Durris, on Deeside, where the trees on 400 acres were sold standing at 60 years old, the average number of spruce per acre being 560. As the average contents per tree were 10 cubic feet, and the price realised was 5d. per foot, the value amounted to £116 per acre.
[Illustration: DOUGLAS FIRS (_Pseudotsuga douglasii_)
It would be vain to expect any such return from spruce planted in such situations as are frequently given to it. In a seaboard exposure it is worse than useless, for no tree becomes more unsightly than a spruce under the influence of salt-laden winds. For such situations, if spruce be grown of any kind, there are other species likely to give better results. I shall name two of these presently, but, first, it may be mentioned that the genus _Picea_ consists of two distinct groups--first, the true spruces, distinguished by having four-sided needles; second, the Omorika spruces, which have flat, two-sided needles. Inasmuch as some species of the second group have silvery undersides to the needles, they are apt to be mistaken for some kind of _Abies_, or silver fir. Here, again, the needle serves to distinguish between them, for, as aforesaid, in the spruce family the needles are set on little peg-like projections on the twig, whereas in the silver firs there is no such projection, but each needle when pulled off leaves a circular scar.
There are probably upwards of twenty species of true spruce, including the Norway spruce. Some of them well deserve attention from the arboriculturist, being exceedingly ornamental, such as the Himalayan Morinda (_P. smithiana_), first raised from seed at Hopetoun House, Linlithgowshire, in 1818, and now flourishing in various parts of the United Kingdom at a height of 70 to 80 feet, with handsome pendulous branchlets.
About Waterer's glaucous variety of the Colorado spruce (_P. pungens_), there is current an amusing account of its introduction to this country some five-and-twenty years ago. The late Mr. Anthony Waterer was an enthusiast in his calling as a nurseryman. A traveller came to him one day with a bag of seed which he said came off the bluest fir he had ever seen. "How much do you want for the bag?" asked Anthony. "Two hundred pounds," was the reply. "Oh! go along with you," exclaimed Anthony, "d'ye think I'm made of guineas?" The man departed, but left Anthony with his mouth watering (no pun intended) for the blue fir. He sent after the traveller, paid him his price, and sold thousands of the seedlings at half a guinea apiece. I cannot vouch for the truth of detail in this narrative, but the tenour thereof is quite in accord with Mr. Waterer's enterprise in his business.