624 Forestry Quarterly. 



measure the high expectations which were placed on it, if seeds 

 are secured from proper localities. It is the most valuable of 

 the introduced exotic species, and has paid completely for all 

 the expense incurred in finding it out. This refers to the green 

 variety from Oregon and Washington, not to the gray one 

 from Colorado. It is found best on fresh sand to mild loam, 

 except near the seashore. Some records of its being frost killed 

 when 20 years old were found to be due to the sudden removal 

 of a protective stand, when drouth from exposure to winds re- 

 sulted. 



Only in seedbeds and transplant beds does frost affect es- 

 pecially the habitual second shoots which do not find time to 

 ripen their wood; but the damage is readily repaired. 



The question of seed supply is discussed in favor of the green 

 rapidly growing variety from the Fraser River. Growth data 

 are given showing remarkable production. The stand, to secure 

 both height and diameter growth, must be kept open. In planta- 

 tion no closer spacing than 4.5 to 5 or even 6 feet is desirable, 

 and four-year old transplants are best used. Smaller stock may 

 be used and closer planting (3.5-4.5 feet) for mixture with pine 

 and spruce, saving expense; the Douglas spruce from the eighth 

 year on shooting ahead and finding good growing space. Thin- 

 nings should be made early and at once severe. Certain experi- 

 mental plats showed that the second thinning in the 28th year 

 should remove as much as 50% of the stem number, the stand 

 at 30 years retaining 360 to 400 trees. 



A few figures of production are given below. 



Thuya gigantea, if grown on suitable, i. e. better soils, loamy 

 sand or fresh mild loam, and with side protection, has been 

 found better than expected a decade ago; it is somewhat liable 

 to succumb to drouth, and being very tolerant, it clears itself with 

 difficulty. Early, severe thinnings, however, are necessary after 

 the clearing. 



Of hemlocks, Tsuge heterophylla (Mertensiana) loses its last 

 shoots readily by frost but as readily recuperates, and on ac- 

 count of its silvicultural characteristics (shade endurance?) and 

 good quality of wood ( ?) is considered worthy of use. Beauty 

 is all that can be claimed for T. canadensis. 



Of broadleaf species as unquestionably commendable with due 

 consideration of the requirements on the site are cited Carya alba 



