between-the Equivalent Numbers of Elementary Bodies. 359 
The analogies pointed out in the several parts of this paper 
evidently lead directly to the construction of series of the same 
ind some of which, together with others depending upon yet 
different relations are given below. 
—Oxygen =-—8 Chlorine ==85°5 Bromine =80 Todine =127 
—Zine =-—326 Magnesia =12 Cadmium =56 Lead =103'5 
24°6 23°5 “24 23:5 
In connection with these two parallel series we may remark 
that oxygen appears to constitute a negative term in the chlorine 
series, * aera as nitrogen does in the phosphorus and zine in 
the cadmium series, with considerable approximation to exact- 
hess. If the atomic weight of chlorine were taken at 36 instead 
of 35°5 it would constitute an exact numerical mean between 
classed in the same series, although certain cases of isomorphism 
can be urged in favor of such a classification. Wiis 
é here see a new instance of the existence of the relation 
of 4445 developed in the first part of this paper. 
Differ- Calculated Received 
ences, equivalents. equivalents. 
sage. SLA . Oxygen = 8 
4). 86 -- .-- ¢ Oilorme, == B06 
song 80 - Ps Bromine = 80 
OY lag ee ee 
veld 197 M =152°5 Silver =108 Mercury 100 
Mercury =100 Cadmium = 56 Magnesium = 12 Glucinum = 47 
. 97 965 96 95°3 
Bismuth — a i =1203 Lead =1035 
Antimony Pay rene ig Petre nn 1 Nitrogen = sill 
87-7 "89 893 895 
Th this double seri 7 e number (89 ap- 
ont es we find nearly the sam nigel 
frp amatively) obtained by subtraction, as by addition in the 
of the double series, part first, section 8. If in that just 
Presented we replace lead by arsenic and give a negative sign to. 
