121

1908 Dec 1
Logic
I.i. 24

family it discovers new (i.e. previously unknown) phenomena or new conditions
under which old phenomena appear and describes them
in their varieties. This is the descriptive family. The second family makes out the general laws
connecting phenomena with their conditions or with other phenomena.
This is the Nomic family or the Nomological order of Idioscopy. The
third and last family measures the quantities involved in the law,
in different cases. This is the Metrical family.

The classes of Idioscopy so far examined are dis-
tinguished by the different sorts of questions that they investi-
gate. Meantime there is a cross-classification, of subsidiary im-
portance, it is true, to the families so far noticed, but perhaps
more important than any subdivisions of those families. This
cross-classification depends upon the different natures of the