XXXV.] 



PITCH PINE. 



291 



Specimens 19 to 24, with the early layers, also 25 

 to 30, with the later layers of wood, were taken from a 

 log of the same dimensions as the last, and under 

 precisely the same conditions as those referred to in 

 Tables CLIV. and CLV., the results being nearly as 

 before; that is, specimen 20, or the second piece from 

 the butt-end of the early growth, and specimen 25, or 

 the butt length of the later growth, are the two strongest 

 pieces of the respective series. We also see in the mean 

 results of the experiments that the strength of the inner 

 is to the outer wood as 733 1755. Thus the outside is 

 as before, the strongest. 



The mean of Tables CLIII. and CLVL, with early layers or inner wood, 

 -=711945. 8 = 2130. 



The mean of Tables CLV. and CLVIL, with later layers or outer wood, 

 E = 763800. S = 2264. 



TABLE CLVIII. 

 Tensile Experiments. 



TABLE CLIX. 

 Vertical or Crushing Strain on cubes of 2 inches. 



