Periodical Literature. 199 



until the sixth year, and later dies off. Spruce also declines after 

 reaching polewood stage first the older needles fall, then the 

 younger, until the tree is leafless and after once more shooting 

 out it dies. As cause is suggested, the salt air, the drouthy winds 

 and raw humus formation, and secondarily, insects. So exten- 

 sive has been the loss that the growing of spruce will have to be 

 abandoned. Northern seed has lately been imported with doubt- 

 ful results. 



On the other hand trial plantations of Picea alba, sitchensis 

 and pungens and of Pseudotsuga taxifolia have proved successful. 

 The first existing in 50 to 60 years specimens is only objectionable 

 because of its slow growth in volume. Picea pungens for the first 

 10 years grew as tall as Norway Spruce. Picea sitchensis has 

 proved the best, an excellent grower, overhauling the Norway 

 on peaty heath soil, and shows in 20 to 25 years no sign of the 

 disease of the latter. In the sea climate it is in its proper element. 



A plantation of about two and one-half acres on fresh humose 

 loamy sand, planted with Norway and Sitka spruce in rows, 

 showed the following relations per hectar, the figures being in 

 metric measure. 



Picea sitchensis. Picea excclsa. 



Age, 25 25 . 



Number, 1946 1198. 



Average height, 12.9 n. 6 



Average diameter, 13.3 11. 9 



Cross section area, 13.10 H3-33 



Volume, timberwood, 77-5 75 • 



Thinning yield 



Number, 426 470. 



Cross section, 2.41 3-24 



Volume, 7.2 15.4 



Sitka Spruce is ahead, healthy, well developed with less taper, 

 the native spruce is less vigorous and shows signs of deteriora- 

 tion, while not a single exotic spruce is diseased. 



Pseudotsuga succeeds excellently in protected situations, and, 

 as conditions for Sitka Spruce improve, they prove less satisfac- 

 tory for Douglas Fir. 



Pimis rigida has proved a failure. 



Deutsche und fremde Nadelholser in Schleswig-Holstein. Zeitschrift 

 fur Forst-u. Jagdwesen, January, 1909, pp. 27-34. 



