| ABC d E | A b CDE |
|---|---|
| a BC d E | ab CDE |
| a B cde | abc D e |
It requires little examination to discover that in the first group B is always present and D absent, whereas in the second group, B is always absent and D present. This is the result which follows from a law of the form B = d (p. 136), so that in this mode of arrangement we readily discover correlation between two letters. Altering the groups again as follows:—
| ABC d E | AB cde |
|---|---|
| a BC d E | a B cde |
| A b CDE | A bc D e |
| ab CDE | abc D e , |
we discover another evident correlation between C and E. Between A and the other letters, or between the two pairs of letters B, D and C, E, there is no logical connexion.
This example may seem tedious, but it will be found instructive in this way. We are classifying only eight objects or combinations, in each of which only five qualities are considered. There are only two laws of correlation between four of those five qualities, and those laws are of the simplest logical character. Yet the reader would hardly discover what