i66 



BOTANY AND PHARMACOGNOSY. 



tion with iodine, but reducing Fehling's solution. The ferments 

 and dilute acids have a similar effect on starch and the dry heating 

 of it at temperatures of i5o°-i7o° C. changes it to dextrin. 



20 



Fig, 97. Successive stages in the swelling and disintegration of wheat-starch grains 

 under the influence of certain chemicals or heat (6o°— 70° C). 



Inulin appears to be an isomer of starch and occurs in solu- 

 tion in the cell-sap of various members of the Compositse and 



