eas 
102 M. C. Lea on Numerical Relations existing 
per ore is isomorphous with silver, while its carbonate, sulphate 
and seleniate are isomorphous with those of the magnesia group.] 
The equivalents of the above metals are related in the following 
manner by the number 44: ; 
Cu 31-7 Zn 82:6 Cd 56 
Mg 12: Mg 12 —Mg 12 ; 
43-7 446 “44 ; 
i 
U 60 U 60 U 60 | 
Mn 27°5 Fe 28 Co 29°5 ; 
875,4=43°75 88, 444 89°5, f= 445 
U 60 U 60 Pb 1035 
Ni 29°6 Cr 26-7 on Ts 380 
89°6, $= 43:5 86°7, $= 43-35 43°5 
Cd 56 Cd 56 Pb 103°5 
Zn 32:6 Cu 31-7 | Fe 28 : 
88:6, L443 87-7, 143-9 1315, 4=438 
and so likewise by adding to the equivalent of lead, the equiv 
alents of manganese, cobalt, nickel, and chromium, we obtain 
in each case a number almost exactly equal to three times the — 
number 44, ee 
To sum up: with Cu:and Mg, Zn and Mg-the sum of 
pair is 44 nearly. se 
With Cd and Mg, Pb and Ur, the difference of each pair ® 
44 or nearly. : 
With U and Mg, U and Fe, U and Co, U and Ni, U and Gy 
Cd and Zn, the mean term is 44 or nearly. eis 
With Pb and Mn, Pb and Fe, Pb and Ni, Pb and Co, Pb and 
Cr, the sum of each pair is three times 44 nearly. <t 
__ it has been before pointed out that the strong analogy exist 
Psi’ 
it 089 - Vanadium, 688 
Titanium, 25. : _ Molybdenum, 48 ~ 
Tantalum, 68-6 Tellurium, 64 | 
Rel: : an ungsten, 92 Niobium, 48°32" 
elations depending upon the number 44 exist between 
quinine = gua 
al, (3), he recent determination of E re, exe 
nal, (2, xxvii, 197. determination of H. Rose, Poggendorff, civ, ext. is 
