Periodical Literature. 479 



gained from the diameter which in different species command a 

 price of 20 cents per cubic foot (cut logs) : black locust 6 inch; 

 ash, 10 inch; walnut, 11 inch; oak, 13 inch; basswood and maple, 

 15 inch; pine and larch, 16 inch; elm, 17 inch; beech, 24 inch. 

 Translating the price per cubic meter into approximate values per 

 M ft B. M. for 12-16 inch logs, cut in the woods the following 

 prices are found : ash and walnut, $44 ; oak, $27 ; basswood and 

 maple, $25; pine and larch, $22; elm, $20; poplar, $21; birch, 

 $18; chestnut, $17; spruce and fir and beech, $16. 



Different species show then, different price movement per unit. 

 In oak, while length does not vary the price more than 15% at 

 most, the diameter may vary it by 1700% over the smallest 

 diameter (6 inch). Here fame plays a role, oak of the Spessart 

 commands three times the price of logs in other forests. In beech 

 the influence of diameter may increase price by 300% ; in other 

 broad leaf species by 400%, the rise beginning only with medium 

 diameters. Spruce and fir show price increases for length in 

 different size classes varying from 3 to 35%, for quality from 

 10 to 21%, but for size up to 200%. In pine the price rises with 

 the diameter up to 500%, so that while the smallest logs bring 8 

 cents per cubic foot, the largest may bring 40 cents. 



It is also interesting to note that the cost per cubic foot of 

 making logs averages for all kinds and sizes just about i cent 

 (about $1.25 per M ft. B. M..) which means i to 10% on the 

 final value ; and transportation from the woods to the woodyard 

 averages for all German forest product 4 cents per cubic foot. 

 This influences the prices in the forest by from 2 to 20%, and that 

 all assortments alike. 



Market price increments in the last decade for beech pro- 

 gressed regularly 1% annually, but oak 3 times as much and in 

 some places over 4 per cent annually for medium sized logs 

 (16-20 inch middle diameter). Oak has experienced such con- 

 stant price increase in the last decade, especially in the Spessart 

 mountains so that "the sum of all increments in spruce cannot 

 measure up to the mere price increment of oak; in other words, 

 the oak in the woodyard unused brings better interest than the 

 spruce in the forest. 



The mathematics of the price curve is then developed in 

 great detail with the use of calculus, and after critical reference 



