to be remembered
with facility, and be usable in thinking when recalled.

REMEMBERING ISOLATED FACTS.--But after all this is taken into
consideration there still remain a large number of facts which refuse to
fit into any connected or logical system. Or, if they do belong with
some system, their connection is not very close, and we have more need
for the few individual facts than for the system as a whole. Hence we
must have some means of remembering such facts other than by connecting
them with their logical associations. Such facts as may be typified by
the multiplication table, certain dates, events, names, numbers,
errands, and engagements of various kinds--all these need to be
remembered accurately and quickly when the occasion for them arises. We
must be able to recall them with facility, so that the occasion will not
have passed by before we can secure them and we have failed to do our
part because of the lapse.

With facts of this type the means of securing a good memory are the same
as in the case of logical memory, except that we must of necessity
forego the linking to naturally related associates. We can, however,
take advantage of the three laws which have been given. If these methods
are used faithfully, then we have done what we can in the way of
insuring the recall of facts of this type, unless we associate them with
some artificial cue, such as tying a thread around our finger to
remember an errand, or learning the multiplication table by singing it.
We are not to be too ready to excuse ourselves, however, if we have
forgotten to mail the letter or deliver the message; for our attention
may have been very lax when we recorded the direction in the first
place, and we may never have taken the trouble to think of the matter
between the time it was given into our keeping and the time we were to
perform the errand.

MNEMONIC DEVICES.--Many ingenious devices have been invented to assist
the memory. No doubt each one of you has some way of your own of
remembering certain things committed to you, or some much-needed fact
which has a tendency to elude you. You may not tie the traditional
string around your finger or place your watch in the wrong pocket; but
if not, you have invented some method which suits your convenience
better. While many books have been written, and many lectures given
exploiting mnemonic systems, they are, however, all founded upon the
same general principle: namely, that of _association