142 PBOPESSOE CALVEET ON THE 



36-748 of substance left 33 013 of oxide, or 89836 



24-540 „ lost 1.775 of nitric acid, or ... . 7-233 

 17-487 „ „ 0*566 of water and ammonia, or 



0189 of water, or . . 1080 

 28-630 „ gare 3-566 of double chloride, or 0-602 



of ammonia, or . . . 2*102 



100.251 



100000 

 I add here a general table of the salts discovered, and 

 those yet necessary to be discovered for completing the 

 series. 



1. Type salt .... 2 (N0« 5 PbO) + 3 HO 



2. New salt . . . . 2 (N0« 5 PbO, NH») + 3 HO 



3. ,, .... 2 (N0« 4 PbO, NH») + 3 HO 



4. „ .... 2 (N0« 3 PbO, NH') + 3 HO 

 6. Not yet obtained . . 2 (NO*. 2 PbO, NH^) + 3 HO 

 6. „ . . 2 (N0« 1 PbO, NH') + 3 HO 



HTDBO-AMMONIACAL NITRATES. 



1. Known salt ... 2 (NO* 6 PbO) + 3 HO 



2. New „ ... 2 (N0« 6 PbO) -f 2 Nff + HO 



3. Known salt ... 2 (NO* 3 PbO) + 3 HO 



4. New „ ... 2 (NO* 3 PbO) + NH»+2H0 



The reasons which induce me to give the formula which I 

 assign to these salts are the following :— -First, the unifor- 

 mity of relation which exists between their different com- 

 ponent parts ; for, excepting the gradual substitution of one 

 equivalent of oxide of lead by one equivalent of ammonia, 

 their other elements, viz., water and nitric acid, remain 

 unaltered. From these considerations I am led to believe, 

 that as the elements composing the new salts keep the same 

 relation as in the nitrates of lead previously known, I 

 should not make an exception, and represent them as 



