Frazer.; *-V£ [Dec. 20, 



the element. Thus a monad atom having but one bond or affinity, exerts a 

 unit of constructive work in the molecule.* 



The percentage weight of each element in the compound divided by its 

 atomic weight and this quotient multiplied by the valence of the element 

 will constitute what is here given as the number of its chemical units. 



Calling a the atomic weight of the element, w the percentage weight, 

 v the valance, and n the number of atoms ; we have 



Chemical units = nv = w v. 

 a 



Subjoined is the table : 



Chemical Units. 



Acid. 



Si 3.387 



C i 0.090 



Ti 0.344 



P 0.011 j 



Basic. 



Al 1.106 \ 12qfi . 



Ye" 0.192 j" 1 -"" ,B | 



3.832 



Fe» 0.206 1 



Mn 0.134 



Ms: 0.390 



Ca~. 0.348 



Na 0.060 



K 0.020 



\ 2.456 

 1.158 J 



Total chemical units of both 6.288 



Excess of acid over basic units 1.376 



4.912 



As the bonds of oxygen must be equal in number to the bonds of those 

 elements which the oxygen links or saturates, it must be assumed that the 

 sum of the bonds of the acid and basic atoms must equal the number of 

 bonds of the oxygen. This last remainder, therefore, gives the amount of 

 oxygen in the compound employed exclusively in a linking function, 

 while the difference between the number of acid and basic atoms 

 ( = 1.376) equals the number chemical units of oxygen which are 

 employed in saturating the acid bonds in excess. 



Reduced to percentage of the rock in question — 



Of the rock there are p. c. of oxygen 44.34 



Of which the saturating oxygen is 5.92 



Leaving p. c of linking oxygen 38.42 



* [It must be distinctly understood here that these expressions do not give 

 the total (chemical) energy of the compound, which, however, could be ob- 

 tained by adding together the product of these units of molecule building 

 multiplied each by the force necessary to disrupt its union. ] 



