{ 401 J 
LXXXVI. Supplement to the Memoir on the Nitrates and 
Nitrites of Lead. By M,. Curvreur*. 
Sixce the publication of my Memoir on the Combinations of 
Lead with the nitric and nitrous Acids +, there have appeared 
in the Annales de Chimie two memoirs on the saihe subject by 
M. Berzelius, being the conclusion of his experiments upon the 
determinate proportions in which the elements of inorganic 
nature exist. I purpose in the present supplement to compare 
our results, in order that a judgement may be formed of the dif- 
’ ferences between those of each. 
M. Berzelius has described by the name of subnitrate at the 
minimum the salt which I have called nitrate of lead: he ob- 
tained it by putting into the solution of octohedral nitrate a 
quaiitity of ammonia insufficient to saturate its acid: I pre- 
pared it by boiling the octohedral nitrate over litharge. Our 
analyses differ but very little, as may be seen: 
Berzclius. Chevreul. 
SittiGineil. <s:dsreterdid «9h 990)) \., 5319786 
BURG. ii hcatiof ele ta afl SUDO ys tein) SUA14 
They agree in proving that this salt contains twice as much base 
as the octohedral nitrate. 
According to the observation which I have made of the cor- 
respondence between the composition of the subnitrite of lead 
at the minimum t with the subnitrate at the minimum§, and 
from the consideration that the carbonic acid when sa od, into 
the solution of subnitrite separated from it such a quantity 
of base, that what remained in it was to the acid in a propor- 
tion which appéared to correspond with the composition of the 
octohedral nitrate ||, I suspected that there must be a subnitrate 
corresponding with the subnitrite oflead at the maximum; and 
I have even said that it would be interesting to inquire if the 
alkalis in acting upon the nitrate of lead would not produce it. 
* Annales de Chimie, tome lxxxiv. p. 5. 
+ See the two preceding numbers of this Magazine. 
t Vor the same reason that M. Berzelius has called the foregoing nitrate 
of lead, subnitrate at the minimum, he has called the subnitrite at the mini- 
mum, the salt which [ have called nitrite; and subnitrite at the maximum, 
that which I have called subnitrite. - I shall adopt this aomenclature, in 
order to avoid all confusion. 
§ Adopting the analysis of the nitric and nitrous acids of M. Gay- 
Lussac. 
|| 1 have said “ appeared to correspond,” because there is a difference of 
2:78 between the result of the experiment and that of the calculation: bit 
this difference may be owing to there remaining iv the solution of the sub- 
nitrite precipitated by the carbonic acid, an excess of this acid which may 
concur in retaining a portion of base. If this be the case, the quantity of 
oxide remaining in the liquor is augmented, 
Vol,43, No. 194. June 1814. Ce This 
