APPENDIX. 385 



In order to prevent fermenting when stacked, the width of the 

 pile should not exceed eight feet. The roof should be formed 

 and thatched as a corn or hay stack. 



The most judicious mode of felling forest trees is by grubbing 

 up, or taking the solid part of the root with the bole, in every 

 case where coppice stools are not wanted, for the expense of 

 taking up the roots afterwards when either planting or tillage may 

 be demanded on the sites of the felled trees, will be found to 

 exceed that of taking up the root with the stem in the first 

 instance, besides the injury to the immediate fertility of the soil 

 by the introduction of fungi and insects, the first agents generally 

 of decomposition of the roots of felled trees which do not stole 

 or reproduce shoots. Besides the advantages now alluded to, 

 there is another, that of the value of the solid part of the roots of 

 trees. The peculiar structure of many roots afford the best 

 materials for what is termed ornamental rustic work ; and also 

 the compact texture of the wood, and the diversified lines of the 

 medullary rays and concentric circles, fit it for the manufacture 

 of very interesting cabinet works. 



APPENDIX. 



The table on the succeeding pages shows the result of 

 experiments for determining the comparative quantities of heat 

 evolved in combustion of the principal varieties of wood used for 

 fuel in the United States, by Marcus Bull, and read by him 

 before the American Philosophical Society in April, 1826. 

 49 



