NOMOS. 



37 



Fig. 2. 



Here, then, we have eight molecules of different 

 kinds, whose changes we propose to follow. And 

 what are these changes ? The first change is, that a 

 molecule of chloride of zinc, c l r z n, is formed by the 

 decomposition of the molecules of hydrochloric acid 

 and zinc, which are contiguous to each other, and 

 by the union of the chlorine, c /', which is a positive 

 element, with the negative element, z n, of the zinc 

 molecule. (This molecule is formed because the 

 negative element of the zinc has a stronger affinity 

 for the chlorine than the affinity which previously 

 kept the chlorine in union with the hydrogen in the 

 molecule of hydrochloric acid.) By this change, 

 the negative element of the hydrochloric acid mole- 

 cule, namely, hydrogen, H, and the positive element 

 of the decomposed zinc molecule, zn', are set free; 

 and other changes are involved. Other changes 

 are involved, because these elements have affinities 

 which must be satisfied. Following these changes, 

 then, the liberated hydrogen re-acts upon the un- 



D3 



