2 H. Gillman—lIndian Mounds in Michigan. 
the same conditions as the skull of a chimpanzee. As the two 
other crania from the same mound offered no such peculiarities, 
the skull which has just been described must be considere 
simply as an extreme case of individual variation from the 
ordinary form. There are no signs of artificial deformity. 
The single tibia accompanying this collection is somewhat 
flattene 
Mr. Gillman, under an appropriation made by the Trustees, 
has explored a series of mounds at the head of St. Clair River, 
and the collections made by him have been received and were 
accompanied with the following report : 
The mounds situated at the head of the St. Clair River ex- 
tend nee south of Fort Gratiot for one and one-half miles 
northward, along the west shore of the river and of Lake Huron. 
It is altogether probable that they reach much farther, both 
northward and southward; but I’ have traced, examined and 
. identified them for the distance mentioned. Similar 
works have been found on the opposite side of the river, in 
Gurinda Isolated mounds in the interior also exist, an in nter- 
oe example of which is seen on the west shore of the Black 
River (a tributary of the St. Clair), at a point about one and 
three-quarter miles southwest of spi the mound referred 
to having been exposed, some years y the grading of a 
road through it, which, as usual, Ain in the loss of a large 
amount of valuable relics. 
With few exceptions, all these mounds have a general resem- 
blance, and bear the appearance of terrace-like embankments 
from ten to twenty and twenty-five feet in height; they are 
‘much longer than wide, and run nearly parallel te the general 
direction of the river and lake shore, which here does not vary 
much from north and south. They are mostly of the Drift for- 
mation, subsequently modified or added to by man for the 
ose objects for which they were occupied, whether for the 
es of interment, habitation, or the manufacture of the 
sae implements connected with the daily life of that period ; 
and, from the to phical features and the geographical posi- 
tion, they must = og formed favorite places of retreat in war 
time. 
Mound No. 1 is composed chiefly of sand and gravel, is 
about two hundred feet me by fifty feet wide, and is fifteen feet 
above the level of the river.. It has rather abruptly-curving 
sides, and is built on a Pn of the idee of Drift formation, on 
which the village of Gratiot stands. 
e excavation, made about fifty feet from the south end 
of the mead disclosed the remains of four human bodies, a 
a depth of four feet from the surface. In an area of about ten 
