combinations. I have tried to arrange these laws and the relationships
resulting from them in an intelligible form, and have been greatly aided
by a paper by Mr. Gillen, published in the "Horn Scientific Expedition,"
on the McDonnell Range tribes. I was unable to get the tribal names, but
this, for the purposes of explanation only, is unnecessary.

The aboriginals in question belong to the Eastern district of Kimberley
generally, and more particularly to the Sturt Creek. These natives are
descended from eight original couples, who have given their names to the
eight classes into which the tribe is now divided.

For simplicity's sake I will assume that in place of eight there were
four original classes. This will illustrate the principle equally well,
and be far less involved.

Let A, B, C, and D represent the names of the four classes--to one of
which every native belongs.

1. The first law is that--Natives belonging to class A may only
intermarry with class B, and natives belonging to C may only intermarry
with class D.

2. The progeny of a man and woman of intermarrying classes is of a
different class from either father or mother.

Thus a man of class B marries a woman of class A, but their offspring
(male or female) is of class D.

Let Am represent a male of class A.