Compound Celluloses 189 



Zeisel, these observers have made an elaborate series of estima- 

 tions, the results being expressed as percentages of methyl 

 (CH 3 ) calculated on the dry substance. They are as under : 



A. WOODS. 



CH, p ct. 



1 ' Extracted ' signifies previously exhausted with water, alcohol, 

 and ether. Otherwise the specimens were analysed without previous 

 preparation. 



