at 
354 M. C. Lea on Numerical Relations existing — 
Ratio of iron to magnesium, 
Ratio of tin to titanium, 
Ratio of gold to silver, 
Ratio of zirconium to aluminum, 
Ratio of calcium to magnesium, ———— == 1:67 
: : Sn 59 
Ratio of tin to zine, - = a is 
| 
Ratio of potassium to sodium, =~ = 1°70 
; ; 7 ; 
Ratio of arsenic to phosphorus, = = wo ae 
Ratio of cobalt to magnesium, pact 8:40; 
; Mg 12 
Ratio of nickel to magnesium, —- =t.2:47 | 
Mg 12 
Ratio of lead to tin, eh ieee ae 2°76 
Sn 59 
Ratio of cadmium to zine, SeEe oaaaly J 
Zn 32°6 
(5. ) 
_it has been the object of this paper to develope as far a8 pS 
sible those numerical relastoli” existing between the atome 
The substances which compose the chlorine group form a wel 
marked family to which fluorine seems also to belong. ©, 
analogies which unite chlorine, bromine and iodine, appear 
multiply with each new investigation of pee Py the 
than by the 
Cent experiments of Pliicker on the spectra obtai heer 
