| 
between the Equivalent Numbers of Elementary Bodies. 107 
- And if to two terms of the same series A we add the equiva- 
lent of bromine, we also find the terms of series OC. 
Magnesium 12 ~ Zine —32°6 
Bromine 80 Bromine 80 
92 47-4 
Tungsten 92 Molybdenum 48 
If we add respectively the four terms of series A with the 
four corresponding terms of series O, we shall in each case obtain 
a number which is very nearly twice forty-four; that is, the mean 
of each pair of series is 44 nearly. 
—Zinc —32°6 Magnesial2 Cadmium 56 Mercury 100 
Antimony 1203 Arsenic 75 Phosphorus 31 -Nitrogen~14 
88-7 87 87 86 
It will be remarked that where a series leads to the equivalent 
of an element, but with a negative sign, that negative sign has 
n in all cases preserved in the further examination of its 
numerical relations. 
(9.) 
_ Itis evident that the number 44—45 plays an important part 
in the science of stoichiometry, and the relations which depend 
Upon it are supported, in some cases at least, in a remarkable © 
manner, by analogies of atomic volume. That such analogies 
are a support becomes evident from the following considerations, 
Solids and liquids are very far from being governed by the 
laws which determine the combinations of gases, in volumes 
either equal or having some very simple relation to one another. 
Therefore, if we find that in some few instances such a relation 
oes hold good with solid substances, we may naturally expect 
ne ce, which unites with the silver without increasing its 
Volume, or affecting the amount of oxygen which it is — e Re! 
chemi 
pee (€x=63°4), which also, under equal volumes, combines 
® quantity of oxygen expressed b 
