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that the being a First or a Second or the being a Reaction
each involves Secondness. An Object cannot be a
Second of itself. If it is a Second, it has an element
of being what another makes it to be. That is, the being
a Second involves Secondness. The Reaction still more
manifestly involves the being what an other makes a subject to be.
Thus, while Secondness is a fact of complexity, it
is not a compound of two facts. It is a single fact
about two objects. Similar remarks apply to Thirdness.

This remark at once leads to another. The
secondness of the Second, whichever of the two objects
be called the Second, is different from the Secondness
of the first. That is to say it generally is so. To kill and to be killed are different.
In case there is one of the two which there is good reason for calling the First,