130 J. H. Priestley and Edith E. North 
lamelke though giving most of the reactions of cellulose cannot be 
classed as pure cellulose in this species as they cannot be dissolved 
under any conditions by a solution of zinc chloride dissolved in twice 
Fig. 4 
Fig- 5 
its weight of concentrated hydrochloric acid or by ammoniacal cupric 
oxide (Schweizer’s reagent). The existing state of our knowledge of 
the chemistry of cellulose hardly permits of a profitable prosecution 
of this point at present, but the existence of a series of more resistant 
bodies, possibly anhydride derivatives allied to cellulose, seems more 
than probable, especially in association with suberin (Zemplen( 34 )). 
