o f Edinburgh, Session 1880 - 81 . 
35 
(3.) Another salt similarly prepared. 
20*11 grs. gave 12*06 grs. = 59*96 per cent. 
(4.) In this case the precipitate was produced by mixing solu- 
tions of lead acetate and neutral ammonium meconate 
22*60 grs. gave 14*64 grs. PbO = 64*77 per cent. 
(5.) This salt was prepared by adding solution of lead acetate to 
solution of neutral morphia meconate. 
6*69 grs. gave 4*07 grs. PbO = 60*76 percent. 
PbC 7 H 2 0 7 = 55*06 per cent. PbO. 
(Pb0 7 H 2 O 7 ) 2 PbO = 64*76 per cent. PbO. 
Pb 3 (C 7 H0 7 ) 2 = 65*91 
PbC 7 H 2 0 7 Pb0 = 7101 
From these results it is manifest that the precipitates obtained as 
above described are of variable composition, and are probably mix- 
tures of different salts. Stenhouse* prepared several basic salts, 
one of them containing as much as 64*7 per cent, of lead oxide. I 
believe it is this tendency of meconic acid to form basic salts, which 
has led to the belief in its tribraicity. 
II. Meconates of Silver 
(1.) Prepared by adding nitrate of silver in excess to solution of 
neutral ammonium meconate. Precipitate dried at 100° C. 
9*82 grs. gave 3*44 grs. Ag = 35*03 per cent. 
12*77 „ 4*47 „ =35*00 „ 
(2.) This precipitate was produced by adding excess of silver 
nitrate to alkaline solution of ammonium meconate, the product 
being dried at 120° C. 
10*050 grs. gave 4*86 grs. Ag= 48*35 per cent. 
9*745 „ 4*72 „ =48*38 „ 
(4.) Prepared by mixing solutions of ammonium meconate and 
silver nitrate, the former being in excess. Precipitate dried at 
100° C. 
10*215 grs. gave 5*195 grs. Ag = 50*85 per cent. 
9*310 „ 4*705 „ =5053 „ 
Gmelin’s Handbook, xii. 428. 
