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 S p.ct. 

 Maple . Stem .... Acer Pseudo-plat anus > L. 3 -06 



. extracted 1 . 3'5 



. ,, shavings . . ,, ,, 3' 6 



Acacia . Branch .... Robinia Pseud-Acacia, L. 2 -37 



,, . Extracted ... 2-45 



Birch . 3 years old ... Betulaalba . . .2-57 

 Pear . . Stem .... Pyrus communis, L. 3*21 



Oak . . . . . . Quercus pedunculatus . 2-86 



,,..,,.... 2-63 



Alder ....... Alnus glutinosa . .2*89 



Ash . . Stem .... Fraxinus excelsior ', L. . 271 



. . Shavings from stem . 2-69 



,, . . Stem shavings extracted . ,, ,, 2'66 



,, . . Shavings from branches . /,, ,, 3'O2 



/Shavings from branches! 

 " ' '1 extracted . . .) " 

 Fir . Stem .... Abies excelsa . ,2*15 



. . , ..... . . . 2-39 



,, . . (central zone) . ,, . . . 2-59 

 . (sap wood) .,... 2-32 



,, . . ..... Abies pectinata^ DC. . 2-45 



Pine . . ..... Pinus sylvestriS) L. . 2-25 



. . Stem .... Pinus laricis . .2-05 



...... 2-12 



Cherry . ,, . , . . Prunus Avium, L. . 2-38 



Larch . ,, . . . . Larix europaa, DC. . I '99 



..... 2-68 



Lime. . ,, . . . . Tilia parvifolia . . 2-56 



Mahogany . ,, . . . . Swietenia Mahagoni> L. 2 -66 



Walnut . . . . . Juglans regia, L. . .2-27 



. Shavings from stem . ,, . .2-69 



Poplar . Stem .... Populus alba . . 2 *59 



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



and ether. Otherwise the specimens were analysed without previous 

 preparation. 



