586 Forestry Quarterly 



above. At the end of this period the original faces would have 

 about grown over. 



Stands showing the effect of protection from fire upon second 

 growth forests are rare in the South. Several such stands of 

 pure Slash and pure Longleaf, however, were located near Glen 

 Saint Mary, Baker County, Florida.^ According to excellent au- 

 thority, no fire had occurred during the life of the stands. A layer 

 of humus and leaf-Utter from 2 to 4 inches in thickness afforded 

 protection to the underlying very deep, sandy soil. One Slash pine 

 stand made up of two age classes contained 209 trees per acre. Of 

 these, 123 trees per acre, averaging 11 inches d. b. h. (9 to 13-inch 

 classes) and 60 feet in height, were 17.5 years old,^* and 86 14-year- 

 old trees averaged 5.9 inches in diameter and 47 feet in height. 

 The average annual height growth was 3.4 feet for all the trees, 

 and the average diameter growth for the older age class .76 inches 

 per year since reaching breastheight.^ The contents of this stand 

 by mill scale taken to 3.5 inches in the top was 10,574 board feet. 

 Since the crown density was .7, it is likely that the stand did not 

 contain the maximum yield for the site by as much as 1,000 to 

 2,000 board feet. If worked for turpentine according to present 

 methods of tapping, the 146 trees per acre, 7 inches and over in 

 diameter, would take about 160 cups. Located about 1 mile from 

 a turpentine still, the cups in this stand would have been worth 

 about 12 cents for a 3-years lease, or a total of $19.20 per acre. 

 If cut for ties at the present time the stand would yield sixty 6 by 

 8-inch cross ties, and ninety-two 5 by 6-inch tram ties per acre. 

 At an average stumpage value of 5 cents each, this gives $7.20, or a 

 total return of $26.40 per acre. At the end of 3 years of rapid 

 growth, however, there would be more ties than at present. De- 

 ducting the expense for taxes, or 5 cents per year for 19 years^* at 4 

 per cent compoimd interest, and assuming an annual cost for fire 

 protection of 10 cents per year for 16 years, also at 4 per cent 

 compound interest, amounting to $3.82, gives the owner a net 



23 On property owned by the Glen Saint Mary Nursery Company, whose 

 courtesy and cooperation in making studies are hereby acknowledged. 



2< Measurements taken on June 13, 1916, or about middle of the growing 



season. 



2* 14.5 years growth since reaching breastheight. 



26 Taken to the end of the turpentine lease of 3 years on a stand averaging 

 16 years old. 



