.260 MR. SADAMA ISHIMATSU ON A CHEMICAL 



This alcoholic extract is precipitated by either acetate 

 of lead or nitrate of silver as a beautiful yellow mass. I 

 took a quantity of this alcoholic extract and precipitated 

 by means of acetate of lead; and the precipitate was 

 thoroughly washed with absolute alcohol^ aud then decom- 

 posed by dilute sulphuric acid ; we cannot decompose the 

 lead-salt with sulphuretted hydrogen (which may be better), 

 as the acid is altogether destroyed by some reducing action 

 of sulphuretted hydrogen or other ; and then the acid was 

 again dissolved in absolute alcohol : thus it was separated 

 from the sulphate of lead. 



Now this alcoholic solution was again precipitated by 

 means of acetate of lead^ and after drying partially in the 

 air-bath, was transferred under the receiver of an air-pump 

 and dried over H2,S04. This lead-salt explodes when 

 heated. The amount of lead was estimated by igniting 

 the salt with HNOj, as PbO ; and also the mass was sub- 

 jected to organic combustion. Nitrogen determined by 

 Dumas^s method. 



The following numbers were obtained as the result : — 



I. II. Mean. 



Carbon 2677 ayio 26*93 



Hydrogen 4"io 4'i2 4'ii 



NOj i8-6o 18-28 18-44 



PbO 47-41 47-43 47'42 



Oxygen 3-12 3-07 3-1 



The formula calculated from these results is 



C„H,,(NO,),PbO,. 



Now, replacing PbOj, by (OH)^, and (NOi)^ by H^, we 

 have 



