140 EXPERIMENT STATION. [Jan. 



due to the stage of development of the roots, since Wichers and 

 Tollens worked upon roots gathered in April and July instead 

 of in November. 



Tanret isolated two distinct crystalline carbohydrates from 

 the root sap, one of which had a rotation of — 35.1 and the 

 other + 0O.3. Syrups A and B fractionated with strontium 

 hydrate showed opposite rotations before inversion, but lack of 

 material has given no opportunity to confirm further his obser- 

 vations. 



Grateful acknowledgment is made of suggestions received 

 from T)r. Joseph B. Lindsey during the jirogress of this inves- 

 tigation. 



