290 Dr. Macneven's Exposition of [Oct. 



Sulphate of lime has been analyzed with great care, and is a 

 compound of 



Sulphuric acid 100-00 5-0 



Lime 72-41 3-620 



That is, 100 sulphuric acid are to 72-41 lime as 5, the integrant 

 particle of sulphuric acid, is to 3-620, the integrant particle of 

 lime. 



Carbonate of lime has been likewise analyzed with great care, 

 and is composed of 



Carbonic acid 43-2 .... 2-75 



Lime 56-8 .... 3-61 



Thus, the equivalent number for hme, by both experiments, is 

 the same ; and as calcium combines with only one proportion of 

 oxygen, we must suppose lime a compound of 1 atom calcium 

 + 1 atom oxygen. 



Calcium 2-62 100-00 



Oxygen 1-00 28-37 



48. Strontium. — The proportional weight of an atom of stron- 

 tium may be obtained after the same manner as that of barium. 

 Sulphate of stroiatium is composed, according to the experiments 

 ofStromeyer, of 



Strontian (viz. oxide of strontium) . . 132-55 

 Sulphuric acid 100-00 



And carbonate ofstroatian, by the experiments of Dr. Thomson, of 



Strontian 234-44 



Carbonicacid 100-00 



Now, since sulphate and carbonate of strontian are composed 

 of integrant particles of oxide of strontium and sulphuric acid in 

 binary combination ; Ave may find the weight of an integrant 

 particle of strontian by knowing that of either of the acids. The 

 integrant particle of sulphuric acid is represented by 5 ; namely, 

 ] atom sulphur = 2, and 3 atoms oxygen = 3 ; and the inte- 

 grant particle of carbonic acid by 2-76 viz. -76 carbon and 2 oxy- 

 gen. To deduce the weight from the sulphate, we use the 

 proportion as 100 sulph. acid : 132-55 strontian :: 5 weight of an 

 integrant particle of sulphuric acid :: 6*62 weight of an integrant 

 particle of strontian, 100 : 132 :: 5 : 6*62. 



To deduce it from the carbonate, as 100 carb. acid : 234-44 

 strontian :: 2-76 : 6-47. The mean of these two 6-62 and 6-47 

 gives 6-5 without any sensible error for the weight of an integrant 

 particle of strontian. 



It is known that 100 parts of sulphuric acid will combine with 

 a base, having 20 parts oxygen ; hence, 132-55 parts of stron- 



