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 3 p.ct. 



Maple . Stem .... Acer Pseudo-plat 'anus ; L. 3 -06 



. extracted 1 . 3-05 



. shavings . 3-06 



Acacia . Branch .... Robinia Pseud- Acacia, L. 237 



,, . Extracted ... ,, ,, . 2-45 



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



Pear'. . Stem .... Pyrus communis, L. . 3'2i 



Oak .... Quercus pedunculatus . 2-86 



it > 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*02 



{Shavings from branches ] 

 extracted . . .) " 



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

 . . . . . . . . 2-25 



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

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

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



,, Abies peetinata, DC. . 2^45 



Pine Pinus sylvestris, L. . 2-25 



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



,,...... . 2-12 



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



Larch . ,, . . . . Larix europcea, DC. . 1-99 



..... . 2-68 



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



Mahogany . ,, . . . . Swietenia Mahagoni, L. 2 '66 



Walnut ...... Juglansregia,\s. . .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. 



