I Si 4.] Definite Proportions in Chemical Comlinations. 137 



Number of Weight of an 



atoms. integrant particle. 



213. Nitrate of zinc 1 n + 1 z 1 1-942 ' 



214. Nitrate of lead 2 n + \ I 41-580 "» 



215. 1st Subnitrate of lead. . \ n + \ I 34-777 « 



21(). 2d Subnitrate of lead. . 2 « + 3 Z 97-528" 



217. 3d Subnitrate of lead . 1 72 + 3 ^ 90-725° 



21s. Nitrate of nickel . . . . 3 n + In SO-714* 



219. Subnitrate of nickel . . 1 « + 7 nick 78-938? 



220. Nitrate of silver 1 n + 1 5 20-421 ' 



221. Nitrate of mercury . . . 1 7^ + \ m 32-803 ' 



222. Pernitrate of mercury 1 n + 2 m 60*803 • 



223. Subnitrate of platinum 1 n + 4 pi 63-447 * 



in the table are theoretic, and calculated on the hypothesis that 100 

 nitric acid combine with a quantity of base which contains 14-666 

 •oxygen. This I conceive to be the truth. 



' This salt has never been analysed ; but as it is a neutral salt, 

 there can be little doubt that its constituents will be as in the table. 



'" Berzelius gives this salt composed of 100 acid + 205-1 oxide 

 (Gilbert's Anualen, 1812, p. 1G6). This I conceive to be exact. 

 It corresponds very nearly with the statement in the table. 



" These are the three subnitrates of lead described by Berzelius 

 in the Annals of Philosophy, vol. ii. p. 278. The first contains 

 twice as much oxide as the octahedral nitrate of lead. It ought, in 

 fact, to be considered as a nitrate, and tlie octahedral salt as a 

 supernitrate. The second contains thrice as much oxide as the 

 octahedral salt ; and the third six times as much oxide. 



" This statement agrees nearly with the analysis of Proust, who 

 found nitrate of nickel composed of 100 acid + 45-45 base 3 but 

 I do not put much confidence in the statement. 



P This would be the result of Proust's analysis, if any confidence 

 could be put in its accuracy. He found the salt a compound of 100 

 3ci4 + 735-3 oxide. 



1 This statement I consider as more correct than any analysis 

 hitherto published. According to it the salt should be composed of 

 100 acid + 200-1 base. Berzelius's analysis gives 100 acid + 

 216-45 base; and Proust's, 100 acid + 233-33 base: but neither 

 of these rcsidts seems entitled to confidence. 



■■ This is a theoretic result, for the salt has never been subjected 

 to analysis. 



• According to this statement the salt should be composed of 100 

 acid + 7-JO-S2 base. JVlessrs. Braamcamp and Siqueira-Oliva make 

 it a compound of 100 acid + 733-33 base. This is a tolerably 

 near apjjroxiination, considering the difficulty of analysing this salt. 



' This a|)proac!ics the analysis of Chenevix. He found the salt 

 » comiHJund of 100 acid + 8090!) base. Now 6-803 : 14 161 x 



