dt 
360 M. C. Lea on Numerical Relations, $c. 
the atomic weight of nitrogen, we shall still have a number con- 
forming to the character of the series, viz., 89. 
In this and the following series the symbol M" representa 
possible metal constituting an intermediate term between anti 
mony and bismuth. That such a metal might exist was pointed — 
. 
out in the consideration of the phosphorus series. 
Bismuth =208 M’ =164 Antimony =1203 Arsenic =75 
Gold =197 M =1525 . Silver =108 Copper =63' 
11 115 12°83 116 
M as before represents an hypothetical metal having forits 
atomic weight a mean term between those of silver and gold. 
Uranium 60 Vanadium 68°6 Tungsten 92 ee 
Magnesim 12 Calcium 20 Strontium 43°75 ee 
48 48°6 49°26 2 
Molybdenum 48 Vanadium 686 Tungsten 92 2 Tantalum 1376 . 
Magnesium 12 Zine 326 Cadmium 56 Mercury 100° 
36 36 "36 a 
The parallelism between the three first terms of these last tW0 
i 
2 
= 
sium is positively exact, perhaps the only known case in whitt - 
absolute exactitude obtains. It is probable that other cases of : 
parallel series exist, and will be discovered. em 
It is not easy to fix the exact amount of importance which 
attaches to the numerical relations up to this time ascertained to te 
. g. Some are 00 
properties as following from relations of numbers. Baie 
by analogy of properties, as unmeaning and unimportant, would 
to err quite as much on the other side. When yet 
yf 
ni 
Be 
chemical characters may be arranged in a series havil ms the 
mon difference or a definite ratio between its terms, COMM” 
Propriety of grouping those elements together, and such cu 
‘ide a correct ¢ 
gies may in doubtful cases assist us in- arriving at 
ification. 
Philadelphia, Feb, 27, 1860. - 
