Compound Celluloses 



175 



retained in all text-books, and may therefore be reproduced 



here. 



A series of determinations has also been made by Gottlieb 

 (J. Pr. Chem. [2], 28, 385). These include the elementary 

 analyses of the woods, and the calorific equivalents in heat units 

 per i grm. burned. 



Cellulose 44-4 



6-2 



4,146 



These results have been extended by G. W. Hawes (Amer. 

 J. Sci. [3], 7, 585) to the woody tissues of Acrogens e.g. 

 Lycopodium, Equisetum, Aspidium, c. and from his inves- 

 tigations he concludes that the same general relationship 

 obtains for these as in the forest trees above given, 



PROXIMATE ANALYSIS. A large number of the woods are 

 characterised by special constituents, more or less of the nature 

 of excreta. To deal with these would lie outside the scope of 

 the present treatment of the subject. We are strictly limited 

 to the fundamental tissue of the woods, considered as ligno- 

 celluloses. Hugo Miiller (Pflanzenfaser, 150) gives the re- 

 sults of analyses of a representative series, the most important 



