CHAP, vi The Metabolic Processes 



399 



with the same band of workers, whose researches on both 

 groups have been numerous since 1878. 



Both lecithin and the products of its decomposition have 

 been discovered in other parts of plants than seeds. Lipp- 

 mann found it in the sugar-beet in 1887. Kunz extracted 

 cholin from various roots in 1886 and 1888, while Stoklasa 

 identified lecithin among the reserve materials of pollen 

 in 1896. 



IV. GLUCOSIDES. A good deal of work during the latter 

 years of the century was concerned with the identification 

 of a large number of members of this group, which in 

 1860 only included relatively few. As, however, they 

 present features of interest rather to the chemist than 

 the botanist, a passing allusion to them must suffice. 

 Researches which concern them were generally conducted 

 rather to determine their role in nutrition and the products 

 of their decomposition during digestion. These will be 

 discussed in their appropriate place. Besides this there 

 remains little more than an enumeration of them, with 

 dates of their identification. 



