50 Cellulose 



of cupric oxide. The former are expressed in terms of (d\ and 

 the latter in terms of dextrose reduction K=ioo (o'4535 grin. 

 dextrose equivalent to i grm. CuO). (a) Solution of cellu- 

 lose at 5. (b) Solution at 15. In both cases the compound 

 obtained was C 6 H 8 O 3 (SO 4 ).2Ba ; the compounds were with- 

 out action on Fehling's solution ; the ' opticity ' varied directly 

 with the temperature of the solution-reaction viz. for (a) it 

 was + 24 ; for (b) + 54. The yield of soluble Ba salt was 

 48 p.ct. of the theoretical; the residue of the cellulose remains 

 associated with the BaSO 4 , obtained on neutralising the acid 

 liquid with BaCCV 



Hydrolysis of the product. The compounds in solution were 

 treated for 30 minutes at 100 in presence of free sulphuric 

 acid (2 p.ct. on the solution). The acid products were 

 isolated in each case as Ba salts. Compounds of identical 

 formula were obtained viz. C 18 H 28 O 13 (SO 4 ). 2 Ba. The yield 

 amounted to (a) 95 p.ct., (b) 80 p.ct. of the total calcu- 

 lated. The remainder was converted into dextrose. The 

 opticities of the products were different, viz. (a) for Ba salt 

 + 25; (&) for Basalt, + 7 5. The CuO reductions were, for (a), 

 K=2 3 - 3 ; for(J),K=i8-i. 



(2) Graduated hydrolysis of the disulphuric ester. The 

 initial product of the empirical composition C 6 H 10 O 3 (SO 4 ) 2 

 was then subjected to hydrolysis in graduated stages, the con- 

 ditions being as before, and the stages being defined by the 

 duration of the hydrolysis, the products being exhaustively 

 investigated at periods of 7, 15, 20, and 30 minutes. The results 

 are summarised as follows : 



C 6 H 8 O 3 (SO 4 H) 2 , when boiled with 2 p.ct. H.SO 4 , yields 

 successively, 



C 6 H 8 3 (S0 4 H) 2 C H,0 4 .S0 4 H 

 C 6 H 8 3 (S0 4 H) 2 3 C 6 H y 4 .S0 4 .H. 

 1 This residue should be investigated. 



