524 Forestry Quarterly 



The very rapid height growth in the juvenile period also is an 

 indication of intolerance, while, to be sure, the remarkable per- 

 sistency of height growth might lead one to class it with the 

 slower but more persistently growing tolerant. The longevity of 

 thespecies, however, accounts for this persistence, the tree growing 

 for 1,000 to 2,000 years, attaining heights of 150 feet and diame- 

 ters of over 8 feet. The difference in rate of development of vir- 

 gin and second growth is shown in various tabulations. Virgin 

 cypress yields are stated to run generally from 8,000 to 14,000 

 board feet, but occasionally over 20,000 feet per acre on con- 

 siderable areas, and selected acres may yield 50,000 and even 

 100,000 feet. What second growth or plantations may produce 

 is, of course, not yet ascertainable. 



Since cypress occupies some 42.5 million acres of what is con- 

 sidered permanent swamp, unfit for profitable cultivation except 

 for timber, and since reclamation of reclaimable swamp lands 

 would cost on the average over $80, hence will for a long time not 

 be undertaken, the question of forest management is important. 

 Such management, according to the author, refers to the handling 

 of present supplies rather than to extension of the species and 

 reproduction. It is a question of market changes rather than sil- 

 viculture which dictates the leaving of certain diameters for 

 later harvest to the lumberman. Conditions where such delay in 

 harvest is profitable vary. The conditions where cutting to a 

 diameter limit is promising policy are discussed. As a rule in a 

 representative stand cutting to an 18-inch diameter limit will 

 leave only 8 to 10 per cent merchantable material. Jn a given 

 case, cutting to 16-inch, 750 board feet worth $3.75 would be left, 

 a small investment for a second cut, since no fire danger is to 

 be anticipated, and the diameter increase in the trees left may be 

 as much as an inch in little over two years, and 8 to 10 board feet 

 per tree. A table showing board feet and percentic increases for 

 trees of different diameter and various financial calculations are 

 evidently designed to interest the lumberman. Although there is 

 not much hope of the use of cypress in planting operations, the 

 author can report a plantation of some 75,000 trees in Ohio, which 

 excels in rapid growth, making 24 foot trees in 10 years. The 

 planting and nursery practice is detailed. With a set of volume 

 and taper tables this most complete and satisfactory study comes 

 to an end. B. E. F. 



