201 



rhombic crystals. Easily soluble in water and boiling 

 alcohol. 



9. Melezitose. 



C 12 H 22 H + H 2 0. 



In the manna of Briangon (from Pinus larix). 

 Small crystals, easily soluble in water, but slightly 

 soluble in alcohol. 



10. Melitose. 



3H 2 0. 



In Australian Eucalyptus-manna. Thin, needly 

 crystals. Is resolved into glucose and an unferment- 

 able syrupy sugar, eucalyn C 6 H 12 6 , when heated with 

 dilute acids or when placed in contact with yeast. 



11. Synanthrose. 

 C 12 H 22 O n . 



In the bulbs of composites, together with irmlin. 

 Most easily isolated from Dahlia variabilis and Helian- 

 thus tuberosus. White, very light, amorphous, deli- 

 quescent mass. Treated with dilute sulphuric acid, it is 

 resolved into fruit-sugar and another variety of sugar. 



12. Cellulose. 



Occurrence. Is the most widely distributed sub- 

 stance in the vegetable kingdom ; is present in the 

 organs of all plants. In a chemical point of view, the 

 material of the cell-membranes of all plants and parts 

 of plants is the same. In those cases, in which it 

 shows certain varieties in the chemical properties, it is 

 to be assumed that these are caused by the presence of 

 substances from which it can be separated only with 

 great difficulty, if at all. In the latter respect, it 

 exhibits the most varied conditions, as can be seen 

 from the dissimilar mechanical constitution of vege- 

 table germs and the young organs of plants, of pith, 



