122 Trans. Acad. Sci. of St. Louis. 



not at all, with iodine. Some are readily soluble in weak acids, 

 as the endosperm of LiUaceae and some related orders 

 examined by Miss Cooley. 



In Polygonatum tnuUijioruTn the membrane was dissolved 

 in one minute when acted on by sulphuric acid, diluted with 

 five parts of w^ater. From this it appears to be Schulze's 

 hemicellulose. According to Winterstein this is sometimes 

 associated with amyloid in certain cell-walls. The mucilage 

 of Astragalus canadensis and Gymnocladusis readily soluble 

 in sulphuric acid, and this is true of many others of the 

 leguminous seed mucilages examined by myself. Some are 

 nearly insoluble in cupra-ammonia. Zimmermann (294a) 

 states that on the addition of nitric acid a part of the gums 

 are changed into oxalic acid, or mucic acid. A part are 

 changed into both kinds of acids. 



Cross and Bevan (320) in their recent work on cellulose 

 make the following 



Classification of the Celluloses. 



A. Typical cellulose and the cellulose group. Cellulose of cotton, flax, and 



hemp fibers. 



a. Boehmeria, Marsdenia tenacissima, Calotropis gigantea, Sunn hemp. 



b. (1) Celluloses of woods and lignifled tissues generally. 

 (2) Celluloses from cereal straws, esparto. 



c. Pseudo-celluloses. 



B. Compound celluloses. 



a. Ligno celluloses. Jute fiber ( Coj-cAonfs) . 



(1) Glycodrupose. Sclerotic cells of pear. 



(2) Lignocellulose of cereals. Straw. 



(3) Woods and woody tissues, wood gum. Oak, cherry, cereal 



straw. 



(4) Coniferous woods, 



b. Pectocelluloses and mucocelluloses. 



(1) Flax cellulose. 



(2) Mucocelluloses. Quince or jalap mucilage. 



(3) Amyloid. Tamarindus indica, IJymenaea Courharil, Schotia lati- 



folia, Tropaeolum majus. 



(4) Lichenin. Cetraria islandica. 



(5) Carragheen mucilage. Fucus crispus. 



c. Adipocelluloses and cutocelluloses. 



(1) Cork. 



(2) Cutose. 



The sources and character of the pectocelluloses have been 

 conveniently arranged by Tschirch (265, 204). His table. 



