1036 



MINNESOTA BOTANICAL STUDIES. 



that four hours drying 1 at 100°-102 D was necessary to remove 

 the three molecules of water present. It was also found that 

 by drying at 104°-106° some of the iodine was driven off. This 

 explained the difficulty in obtaining satisfactory results in the 

 early analysis. A careful determination of moisture was made 

 raising the temperature gradually to 114 c , with the following 

 results: 

 2.362 



The substance showed decided indications of decomposition 

 at 112-114°, and at 120° began to frit, changing to an almost 

 black waxy mass As will be seen from the above numbers, 

 the substance dried to constant weight at 100° loses three mole- 

 cules of water. 



2.362 dried at 100° lost 0.118 water 

 Calculated for 



C30H40NO9I4 +3HoO Found 

 3 Ho 0=4.68 4.99 



It was found, on examination, that the loss which occurred 

 by heating above 102° was due to iodine, and that by drying at 

 110° to constant weight one-fourth of the iodine could be driven 

 off. 



2.362 grm. substance dried to constant weight at 110° lost 

 0.382 1 + HoO. 

 Calculated for 



C30 H 40 N0 9 1 3 + I + 3 Ho O Found 



I + 3 Ho = 15.7 16.17 



An attempt to remove another atom of iodine was unsuccess- 

 ful, as is indicated by the above experiment, although the loss 



