OP ARTS AND SCIENCES. 491 



III. 1.5 grm. of the wood when heated for 1^ hours at 158° gave 4.6 



mg. direct and 1.9 mg. indirect CO, 



IV. 1.5 grm. of the wood when heated for 3f hours at 140° gave 6.1 



mg. direct and 3.5 mg. indirect CO^. 

 V. 1.5 grm. of the wood when heated for 5 hours at 120° gave 3 



mg. direct and 4.2 mg. indirect CO^. 



VI. 1.5 grm. of the wood when heated for 6 hours at 100° gave 2.9 

 ms:. direct and 4.6 mff. indirect CO2. 



Decayed Pine Wood. 



We have made no experiments witli sound hemlock, but with de- 

 cayed hemlock we have obtained the following results. The wood 

 taken was from sample G used in the preceding paper. 



I, 1.5 grm. of the wood when heated for 1 hour at 195° gave 19.3 

 mg. direct and 7.8 mg. indirect CO.,. 

 II. 1.5 grm. of the wood when heated for 1 J hours at 180° gave 16.6 

 mg. direct and 4.6 mg. indirect CO^. 

 III. 1.5 grm. of the wood when heated for 1 hour at 160° gave 8.8 



mg. direct and 2.7 mg. indirect CO^. 

 IV. 1.5 grm. of the wood when heated for 1 hour at 140° gave 3 mg. 

 direct and 0.7 mg. indirect CO2. 

 V. 1.5 grm. of the wood when heated for IJ hours at 120° gave 1.7 



mg. direct and 0.5 mg. indirect CO^. 

 VI. 1.5 grm. of the wood when heated for 2 hours at 100° gave 1.5 

 mg. direct and 0.5 mg. indirect COj. 



