water* The main portion of the poisonous mixture was then 

 dissolved in 95;o alcohol and lead acetate in 50jx> alcohol was 

 added. The precipitate was filtered, washed, decomposed by- 

 hydrogen sulphide in a mixture of water and ether. The ether 

 solution was filtered aad evaporated. The residue was a tar 

 which on standing in a desiccator for some time became dry- 

 enough to break into sticky lumps. An alcoholic solution 

 of this substance gave a dark color with ferric chloride aad 

 a light colored precipitate with lead acetate. 



To get more of the poisonous tar for study, E33 gm. of 

 original material were extracted with 95^ alcohol. Strong 

 alcohol was used in order to dissolve as much of the tar as 

 possible. The solution had a dark greenish color but was 

 somewhat yellow in thin layers. The undissolved tar was 

 filtered off and extracted twice again in the same way. The 

 tar left after the third extraction was only slightly soluble 

 in aloohol, and its solution was not poisonous. The three 

 filtrates from these three extractions were precipitated 

 separately by lead acetate in 50^ alcohol. The first preci- 

 pitate was larger, darker in color, and carried down more 

 tarry matter. The second was not as large as the first and 

 was light green. The third was quite small, was black, 

 and was not a lead compound at all but some of the tar which 

 separated out on diluting the strong alcohol with the weaker 



-42- 



