REFERENCES 189 



breakage must be kept in mind. If the work is started early 

 any stand can be made comparatively resistant to storms by 

 systematic thinning. The development must be gradual. If 

 thinned too heavily at first the entire remaining stand may 

 be lost. Dense stands of tall, small crowned trees which have 

 gone for years unthinned reach a stage when it is dangerous 

 to make even a Hght thinning. Timber of this character 

 ordinarily must be left untouched until ready for regenera- 

 tion. Danger of windfall after thinnings is greatest on wet 

 ground, thin soil and exposed sites and with shallow rooted 

 species. 



Plantations closely spaced (6x6 feet or less) will require 

 thinning soon after they close. So many individuals in a 

 plantation are all of about the same size and vigor when they 

 meet that an even but severe struggle takes place, which is 

 apt to leave all the contestants aHve and seriously weakened. 

 If thinnings are impracticable, this should be allowed for by 

 using wide spacing in the plantation. 



REFERENCES 



1. KuNZE, Max. Untersuchungen iiber den Einfluss verschiedener 

 Durchforstungsgrade auf den Wachstumsgang eines Kiefernbestandes. Mit- 

 teilungen aus der Konig. Sachsischen forstlichen Versuchsanstalt zu Tharandt. 

 Band i, Heft 2, 1913. 



2. Caccia, a. M. Forest Research at Cambridge. Quarterly Journal of 

 Forestry, Vol. VIII, 1914, p. 130. 



3. Biennial Report of the Forestry Commission, State of New Hampshire, 

 for the years 1905-1906, pp. 238 and 249. 



4. Cook, H. O. Forest Mensuration of the White Pine in Massachusetts, 

 State Forester's Office, Boston, 1908, pp. 21 and 30. 



5. ScHLiCH, W. Manual of Forestry. 3rd edition. London, 1905. Pp. 

 345-347, 350-351, 362-363 and 366-367. 



6. Wood, B. R. Increment Fellings with Some Possible Applications to 

 the Chir Pine. Indian Forester, Vol. 42, 1916, pp. 283-286. 



7. NiSBET, J. Studies in Forestry. O.xford, 1894. P. 196. 



