ammonium chloride (the lecturer stated above that here N was a pentad,
the addition of the chlorine having caused the N to assume the pentadic
character), it may be said, why should you not suppose that it is the
chlorine "which has altered its valency, and that the compound should be
written:

{H
{H
N { \
{H--Cl
{H/

There is something to be said for this view, but on the whole the
balance of the evidence is in favor of nitrogen being a pentad.

In conclusion the lecturer stated that his principal object was to
direct the attention of chemists, and especially of young chemists, to
the question: Is there or is there not any evidence derived from
the properties, the decompositions, or the relative stabilities of
substances to warrant us in believing that two classes of compounds
exist: one class in which there is interatomic connection alone, and
another in which the connection is molecular?

* * * * *




FRENCH TOILET ARTICLES.