206 MEMOIR OF DR. DALTON, AND 



vitriolic acid it is 4320, and if alumina acts towards muriatic 

 acid with the force of 734, and towards vitriolic acid with a 

 force of 1023 forming common alum, in the same manner 

 the baryta is attracted with a force of 4320 towards vitriolic 

 acid, forming heavy spar, and so the power by which this 

 acid forms common alum is only 1023. If we inquire into the 

 affinity of the other alkaline earths towards vitriolic acid by the 

 rule of three, we obtain for lime ^-H^H^^=1543, for magnesia 

 iif^vs^—Ugg^ jf^ then, in the cases of double affinity given, 

 we put instead of the quantity the attractive force by which 

 one element works on another, we obtain, according to the first 

 theorem of the ' Pure Stoechiometry,' as follows : — 



No. 1. 



Baryta. Muriatic Acid. 



3099 Baryta Salt. 3099 



4320 734 



;5$-* 



^ 



% 



V 



N*^" 



%. 



734 4320 



1023 Common Alum. 1023 



Alumina. Vitriolic Acid. 



<t J) * * * jjj ^Q^ J |.jjg |.^Q positive or decomposing 

 elements are 4320 and 734, the negative which hinder the 

 compound are 3099 and 1023, consequently 4320-1-734=5054 

 the whole positive or furthering, and 3099+1023 =4122 the 

 whole negative or hindering power. * * * " The difference 

 (equal to the power, as he says) =-f 932 is positive. 



He then endeavours to shew in the same way, page 171, 

 &c., that " The masses (quantities) of the three alkaline salts, 



