between the Equivalent Numbers of Elementary Bodies. 99 
—149, very nearly the double of the equivalent of arsenic, a 
previous term in the same series. These results are exhibited 
in the following table. 
ences, equivalents, ncaa 
raqcue bane aeoe 
eat ee eee ye 
an ee 
ice a Vr ee et 
nt a 59 - - §n= 59 
eT lk; ee ee 
is} 45, aes 
a ge 
45) 039 - - 9Sb== 2406 
ok. 
oe eee 
#45 oLgye gscvie nade shame 
SAS os4i0 3 Jo es 116 
_ It will be seen presently that the number 164, the elevénth 
term in the above table, occurs also in the ascendin ositive 
Series, and may represent the equivalent of a metal existing but 
as yet unknown. : 
t We examine the position oceupied by antimony, arsenic, 
Phosphorus and nitrogen in the electro-chemical scale of Berze- 
4S we shall find that in proportion as their equivalent numbers 
diminish, their properties become more and more electro-nega- 
tive; a corresponding change is also visible in the organic radi- 
cals which these elements are capable of forming by their union 
With carbon and h drogen. The passage from the positive tothe 
hegative sign in the interval between phosphorus and nitrogen 
1S accompanied by a marked change in the nature of the organic 
Tadicals into which these elements ee syN ans not 
8 the power of combining directly with oxygen, chlorine 
and sulphur which 3(C,H,)P, 3(0,H,)As, 3(C ,H,)Sb exhibit 
- M80 high a deoree. The methyl compounds show the same 
- differences asthe ethyl. Standing between nitrogen and arsenic, 
_ F’esphorus is every way more closely allied to the latter of 
\ 
