4 62 B O 7 V* AYCW /. J//67v' 6> TE CHNIQ UE. 



'glucose, through the action of hot dilute mineral acids, by 

 which true celluloses are not affected. They are dissolved 

 by dilute alkalies and by cuprammonia after brief treatment 

 with hot dilute hydrochloric acid, too short to cause their 

 solution.] 



a. Reiss' Reserve-cellulose. 



286. The so-called reserve-cellulose has been prepared by 

 Reiss (I) from the endosperm of Phcenix dactylifera, Phyt- 

 elephas, and various other seeds with strongly thickened 

 cell-walls. It differs from the ordinary cellulose especially 

 in the products resulting from hydrolysis with sulphuric 

 acid. There is first formed a compound corresponding to 

 dextrine, but laevo-rotary (seminin), and then a dextro-rotary 

 sugar which reduces Fehling's solution and is fermentable 

 iseminose] and especially characterized by the fact that 

 it forms with phenylhydrazin acetate (C 6 H 5 NH.NH 2 ) an 

 hydrazon, which may be obtained in crystalline form, of the 

 composition C 12 H 18 N 2 O 6 , probably according to the reaction: 

 C 6 H 12 O 6 + C 6 H 8 N 2 = C 12 H 18 O 6 N 2 + H 2 O. Reserve-cellulose 

 cannot be distinguished microchemically from ordinary cel- 

 lulose and behaves quite like pure cellulose with iodine solu- 

 tions and cuprammonia. 



An exception is shown only by the cell-walls of the endo- 

 sperm of Paris qnadrifolia and Fccniculum officinale, which 

 are insoluble in cuprammonia, although they give seminose 

 on hydrolysis and must therefore be regarded as reserve 

 cellulose. 



[Schulze finds (II) that this substance shows the characters 

 of other hemicelluloses (cf. 285) and should be placed 

 among them, with the name mannose.~\ 



b. Paragalactan. 



287. The name paragalactan has been given by E. Schulze 

 (cf. Schulze I, and Schulze, Steiger, and Maxwell. I) to a 

 compound recognized in the thickenings of the walls of the 

 cells of the cotyledons of Lupinus luteus, with true cellulose, 

 and which very probably occurs in other Legnminoscc. It 



