Compound Celluloses 183 



substance. The following observations may be cited (loc. cit. 

 p. 225) : 



Wood of Quercus nigra. 



Furfural 

 2-12 years old ..... 10-6 p.ct. 



69 ,, 10-5 



109-110 10-3 



Liriodendron tulipifera. 



19-21 years old 9-8 p.ct. 



59-6o 9-4 



Magnolia acuminata. 



Year rings of this tree not distinctly discernible. 

 Younger than i o years . . . 8 '8 p.ct. 

 Old heart wood . . . . 8-4 



Platanus occidentalism 



4-10 years old . . . . .9-8 p.ct. 

 71-79 (Heart wood) . . 97 



Prunus pennsylvanica. 



f(l) 4-12 years old .... I o -8 p.ct. 



*(2) 10-4 



,(i) 60-70 .... 9'8 



1(2) 9-6 



In the above it will be observed there is a slight diminution 

 in the furfural with age, but the maximum difference may be 

 taken at i p.ct. on the wood, or approximately 10 p.ct. on the 

 furfural-yielding constituents themselves. 



In other specimens, on the other hand, a slight increase was 

 observed, thus : 



Juglans cinerea. 



Furfural 



j (I ) 4-18 years old .... 9-1 p.ct 



.... 8-9 



60-65 .... 9-6 



t 9'5 > 



Fraxinus americana. 



2-7 years old ..... 8*9 p.ct 



51-52 9'4 



<8 



