190 Cellulose 



CH,p.ct 



Beech . Stem .... Fagus sylvatica . . 3 -02 



.,)....,, . . 2*62 



shavings ,, . 270 



Elm .,,.... Ulmus campestris . .2-92 



. shavings extracted . ,, . .275 



Willow Salixalba . . .2-31 



B. FIBROUS PRODUCTS. Natural and prepared. 



Jute (Lignocellulose) 1-87 



Swedish filter paper .0-0 



Cotton O'O 



Flax, unbleached .... Linum usiiatissimnm . cro 



Hemp ,, Cannabis sativa . .0-29 



China grass,, . . . . . Bohmeria nivea . .0-07 

 Sulphite (Cellulose) .... Pinus sylvatica . .0-34 



C. M I SCELLANEOUS. 



Cork Quercus suber . . 2*40 



. 2-47 



Nutshells fitglans regia . . 3 74 



Lignite (Wolfsberg) 2*44 



Brown coal 0*27 



From these determinations it is evident that the formation 

 of methoxyl groups is an essential feature of lignification, and, 

 moreover, that the formation takes place with remarkable 

 uniformity over a wide range of woody tissues. This uni- 

 formity is, indeed, such that Benedikt and Bamberger proposed 

 to adopt the ' methoxyl number ' as the quantitative measure of 

 any wood lignocellulose present in an unknown fibrous mixture, 

 e.g. for determining the proportion of ' mechanical wood pulp ' 

 in papers. From the above table it would be easy to calculate 

 the degree of approximation (probable error) to be attained, 

 and we may be satisfied to note that the approximation is 

 sufficiently close to make such determinations distinctly valu- 

 able for the purpose in question. These authors were also 

 enabled to draw from their results certain conclusions of 

 physiological significance, viz. : (i) there is in the woods a slight 



