24 BUREAU OF AMERICAN ETHNOLOGY [BULL. 81 
The finding of potsherds which have one or more grooves cut in 
them is not usual in this section of the country. (Pl. 21.) Thesandy 
content of the paste used in making pottery presents a fine surface 
for rubbing down a small bone tool to a fine point. 
Pieces of slate were sometimes rubbed against other harder stones 
and the dust used as a black pigment. There are several pieces of 
slate that were used for that purpose in the collection. It is the 
belief of the author. that the black paint derived from this source 
was not used for other than ceremonial purposes. (PI. 22.) 
A number of round, flat covers made of stone were found in situ 
over the mouth of the storage jars under the floors and thus their 
use is indicated. There were many of themintheruin. (Pl. 23, A.) 
All through the ruin were found conical stones varying greatly in 
size and height. They were invariably found in fireplaces, and so the 
author has called them firedogs or andirons. Usually they were in 
groups of three, and in one case, room 8, location 3, the remains of 
a black cooking pot were still sitting on the top of the three. They are 
all badly burned and in a very friable condition. The largest one 
taken out is 292 mm. in height and 140 mm. in diameter at the bot- 
tom. Practically all of them were made of sandstone. (PI. 20, D.) 
The black polished surface of the baking stones found in the ruin 
plainly indicates their character. They were used for making the 
‘tissue paper’’ bread which is still used in some of the pueblos. 
In room 8, location 3, were found a lot of flat stones used for pav- 
ing the floor. (Pl. 8.) The use of stone as a pavement in the 
rooms was unique and very seldom occurs on the Jemez Plateau. 
Many odd-shaped stones showing a few marks of use were found 
and one of the most unique is the stone ball and ring (pl. 20, C) which 
was found in room 1, location 5. The stone ring, which is a natural 
formation, is 63 mm. at the largest outside diameter, with a hole 
having oblique sides. This hole is 32 mm. at the largest diameter. 
All of the surfaces of the ring show some rubbing. Deposited in the 
hole was a hematite ball, perfectly round and polished. (Pl. 20, C.) 
The large slab of stone found on the floor in room 7, location 3, 
was used as a door to close the doorway between rooms 7 and 8. 
It was found at the base of the wall beside the doorway. It meas- 
ures 305 mm. across the base, 203 mm. across the top, 465 mm. in 
length, and is of an average thickness of 30 mm. One side of it 
shows plainly the pecking done to dress it to the desired thickness. 
The top corners are rounded to fit the doorway without really 
entering it. 
BONE ARTIFACTS 
The ruin of Po-shu yielded an unusually large number of bone arti- 
facts. The variety of form and excellent workmanship show a vast 
and varied use of bone as a material for making certain types of arti- 
