99

The latter class which d.o not much exceed
half a dozen require, one and all of them,
gamma graphs to express them. In particular
the broken cut enters into every one,
and into some of them with curious complications.

One is surprised to find how extremely
complicated are the graphs that express
some of these fundamentals of the nature
of graphs; and this complication puts
into a strong light
two merits of this system of existential
graphs. For, on the one hand, it shows the extraordinary
analytical power of the system that
analyzes conditions which seemed on our first