[BERKELEY] PENTOSE COMPOUNDS 47 



yielding substances present in these tubes seem, however, to be of an 

 entirely different nature to the others dealt within this paper. They 

 are insoluble in water and are not readily extracted. They are at 

 present under investigation.^" 



The work herein recorded was carried out at the Marine Biological 

 Station, Nanamio, B.C. 



"The substance present in the tube of Mesochœloplerus taylori has recently 

 been shown to be a compound of the nature of chondroitin sulphuric acid 

 (Berkeley, C, Journ. Biol. Chem., 1922, L, in the press), the furfurol-yielding 

 component of which is glucuronic acid. 



