. Botanical gazette. Plants. 330 BOTANICAL GAZETTE [NOVEMBER solution, in which i cc. represents 3. i mg. of copper. The corre- sponding equivalents of the different sugars expressed in milligrams were found in the Munson-Walker table. The weight of sugar found divided by the material used gives the amount of sugar con- tained in I gm. of material. The soluble carbohydrates are in Fi and F^. The reducing sugar was first determined. The non-reducing sugar was obtained by subtracting the reducing sugar from the total sugar by hydro- chloric acid hydrolysis at 67-69° C. for 10 minutes. The insolu
. Botanical gazette. Plants. 330 BOTANICAL GAZETTE [NOVEMBER solution, in which i cc. represents 3. i mg. of copper. The corre- sponding equivalents of the different sugars expressed in milligrams were found in the Munson-Walker table. The weight of sugar found divided by the material used gives the amount of sugar con- tained in I gm. of material. The soluble carbohydrates are in Fi and F^. The reducing sugar was first determined. The non-reducing sugar was obtained by subtracting the reducing sugar from the total sugar by hydro- chloric acid hydrolysis at 67-69° C. for 10 minutes. The insoluble carbohydrates are in F3. They consist essentially of colloidal polysaccharides, the greater part of which was starch. The polysaccharides were determined by the FehHng solution after acid hydrolysis for hours with a reflex condenser. TABLE III The carbohydrates in the green plant Material Total carbohydrates. . Reducing carbohydrates Non-reducing Polysaccharides Total carbohydrates. . Reducing carbohydrates Non-reducing Polysaccharides Total carbohydrates. . Reducing carbohydrates Non-reducing Polysaccharides Roots Stems Branches Leaves June 3 collection (1-4 inches). 12 76 June 20 collection (6-8 inches) 26. 2Q 2. 24 9-3° 9-43 14-75 1495 II .00 II. 12 5-71 556 July 8 collection (20 inches) 15-32 3-«2 3-71 7-15 1-50 9-93 15 18 15 07 5 00 5 10 I 18 I 02 9 00 8 95 Trace Trace The percentage of the diflferent carbohydrates of various organs estimated at different times throughout the growth period is tabu- lated in table III. Curves showing the changes in different sugar content in these organs are given in figs. 6-8. These curves show that in the roots the reducing sugars remain constant, while the. Please note that these images are extracted from scanned page image
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