"new English books" into the two Classes, "new
English bound books" and "new English unbound books", and had
assigned the S.W. _Inner_ Cell to the one, and the S.W. _Outer_
Cell to the other.]

It is evident that we have now assigned the _Inner Square_ to the
m-Class, and the _Outer Border_ to the m'-Class.

[Thus, in the "books" example, we have assigned the _Inner
Square_ to "bound books" and the _Outer Border_ to "unbound
books".]

When the Reader has made himself familiar with this Diagram, he ought to
be able to find, in a moment, the Compartment assigned to a particular
_pair_ of Attributes, or the Cell assigned to a particular _trio_ of
Attributes. The following Rules will help him in doing this:--

(1) Arrange the Attributes in the order x, y, m.
pg041
(2) Take the _first_ of them and find the Compartment
assigned to it.

(3) Then take the _second_, and find what _portion_ of that
compartment is assigned to it.

(4) Treat the _third_, if there is one, in the same way.

[For example, suppose we have to find the Compartment assigned
to ym. We say to ourselves "y has the _West_ Half; and m has the
_Inner_ portion of that West Half."

Again, suppose we have to find the Cell assigned to x'ym'. We
say to ourselves "x' has the _South_ Half; y has the _West_
portion of that South Half, i.e. has the _South-West Quarter_;
and m' has the _Outer_ portion of that South-West Quarter."]

The Reader should now get his genial friend to question him on the Table
given on the next page, in the style of the following specimen-Dialogue.

Q. Adjunct for South Half, Inner Portion?
A. x'm.
Q. Compartment for m'?
A. The Outer Border.
Q. Adjunct for North-East Quarter, Outer Portion?
A. xy'm'.
Q. Compartment for ym?
A. West Half, Inner Portion.
Q. Adjunct for South Half?
A. x'.
Q. Compartment for x'y'm?
A. South-East Quarter, Inner Portion.
&c. &c.

pg042
TABLE IV.

.-----------------------------------------------.
| Adjunct | |
| of | Compartments, or Cells, assigned |
| Classes. | to them. |
|----------|---------------------------