solution. The main solution was filtered and the precipitate 

 supposed to be a fatty acid was saved. The filtrate was 

 neutralized with Ijarium carbonate, filtered, evaporated, freed 

 from caramel, and the solution then gave the tests mentioned 

 above for rhamnose, 



A portion of the precipitate supposed to be a fatty acid 

 was ignited in a porcelain spoon. It fused, carbonized, and 

 burned. The remainder was heated with alcoholis potash and 

 reprecipitated with hydrochloric acid. The precipitate was 

 washed and heated with alcohol. Part of it dissolved. The 

 insoluble part was foujid to be a lead compound. On boiling 

 it with hydrochloric acid and cooling, lead chloride crystal- 

 lized out. This was confirmed by dissolving the lead chloride 

 in hot water and precipitating as lead sulphide. These 

 experiments were not carried farther on account of the small 

 (luantity of material, but they show that the gummy substance 

 obtained from filtrate A contained rhamnose (either as a lead 

 compund of free sugar or as a lead compound of a rhamnoside), 

 and also, most probably, the lead compound of an organic acid. 



THE F^GRAUT DISTILLATE. 



Several times in the course of this work, extracts of 

 the original plant material in alcohol and in water were dis- 

 tilled under diminished pressure for the purpose of concentrat- 



1. A wax obtained from Rhus succedanea was .;hown by Stahmer 

 to contain palmitic acid and glycerol in the form of 

 glyceryl palmitate. Annalen 43, 343, (1342). 



