1813.] Definite Proportions in Chemical Combinations. 295 



Number of Weight of an 



atoms. integrant particle. 



168. Sulphate of magnesia 1 s + 1 m 7*368* 



169. Sulphate of lime 1 s + 1 Z 8-620 f 



170. Sulphate of barytes 1 s + 1 b 14*731 « 



171. Sulphate of strohtian 1 s + 1 sir 1 1*900 h 



172. Sulphate of alumina 1 B + 1 a 7*136' 



173. Subsulphato of alumina . ..1 s + 2 a 9'272 



17*. Sulphate of yttria 1 « + 1 Jf 13*400 k 



175. Sulphate of glueina 1 s + 1 g 8'600 



176. Sulphate of zirconia 1 s + 1 z 10*656 



177. Alum 4 s + 2 a + 1 p 30*272 • 



42-561 :: 5 : 2'128, and ^^— = 1-064, which differs but little 



from the weight of an atom of ammonia, 



According to Dr. Henry, sulphate of magnesia is composed 

 of 100 acid + 47*36 base. This exactly agrees with the state- 

 ment in the table : nor could it be otherwise, as the weight of 

 magnesia was estimated from that analysis. Berzelius makes it 

 100 acid + 50*06 base. {Gilbert's Annalen, vol. xl. p. 256.) 



f This coincides almost exactly with the analysis of Berzelius. 

 He found sulphate of lime composed of 100 acid + 72*41 base. 

 Now 5 : 3*620 :: 100 : 72-40. 



8 This coincides with the analysis of Berzelius, who found 

 sulphate of barytes composed of 100 acid +194 base. Now 

 5 : 9*731 :: 100 : 194*62. 



h The weight of strontian was deduced from the supposition 

 that the sulphate of strontian is composed of 100 acid + 138 

 base. Of course the number in the table is conformable to 

 that supposition. 



1 According to Berzelius, sulphate of alumina is composed 

 of 100 acid + 42*722 alumina. (Gilbert's Annalen, vol. xl. 

 p. 262.) Supposing the salt composed as in the table, the 

 number representing an atom of alumina should be 2*136. 



k Neither tliis nor the two following salts have been hitherto 

 analysed; but I have inserted them in the table, stating their 

 composition from the very probable analogy that they are com- 

 posed of] atom of acid united to 1 atom of base; this being 

 i he case with all the preceding neutral salts in the table, except 

 the sulphate of soda. 



1 This seems to be a combination of an integrant particle of 

 three different salts: namely, 1st. Sulphate of potash, composed 

 i 'I 1 $ + 1 p. 2d. Sulphate of alumina, composed of 1 a + 1 a. 

 3d. Supenulphate of alumina, composed oi 2 s + 1 «. These 



