138 PROFESSOR CALVERT ON THE 



EqtdTSlents. Per cent 



lOPbO = mo = 86-736 



2 NO« = 108 = 8-444 

 2NH» = 34 == 2-658 



3 HO = 27 = 2-112 



100-000 

 Therefore, this new salt is the sexbasic nitrate of lead, in 

 which one equivalent of oxide of lead is replaced by one 

 equivalent of ammonia. The following formula explains 

 its composition : — 



Hydrated sexbasic nitrate of lead, 2 (NO* 6 Pbo) 3 HO 

 Hydrated ammoniacal quintibasic nitrate of lead, 2 (NO* 5 PbO, NH') 3HO. 



ANHYDROUS QUINTIBASIC NITRATE Or LEAD. 



This new nitrate is left as a residue by the previous salt, 

 when it is just sufficiently heated to lose its water and am- 

 monia. This salt possesses but little interest. It is a white 

 powder, which becomes of an orange colour when heated, 

 and leaves a beautiful yellow massicot. 



These are the numbers furnished by analysis — 



Per cent 



13-350 of substance lost 1-173 of nitric acid, or 8-786 

 Oxide of lead, or 91-214 



100-000 



HYDRATED AMMONIACAL QUADRIBASIC NITRATE OF LEAD. 

 This salt was prepared by pouring an excess of ammo- 

 nia in a stream, into a saturated solution of nitrate of lead, 

 of specific gravity 1*315 at 60° Fahrenheit; and on the 

 whole being left in contact for 24 hours, the precipitate, 

 which seemed amorphous when first thrown down, changed 

 itself gradually into voluminous crystals, which appeared 

 to be oblique rectangular prisms. After washing in a close 



.4 



