182 PBEFOEATED STONES. 



Fig. 37 on the plate is from one found by Dr. Yarrow's party in one of 

 the graves at Dos Pueblos It is of basalt, now very much decomposed, 

 and apparently was long* used. Its present weight is nineteen ounces. It 

 is nearly 2 inches thick by 4 in diameter. The hole is larger than usual, 

 being 2 inches in diameter at each face, whence it tapers toward the centre, 

 where it is 1 J inches wide. 



Fig. 29 represents a similar stone from the island of San Nicholas, and 

 is now in the Smithsonian collection (18426). This is about 1£ inches in 

 thickness by 4 in diameter. 



Three of like character (P. M. 13521), varying from 3£ to 4J inches in 

 diameter, were obtained by Mr. Schumacher on the island of San Clemente. 



A smaller specimen from San Nicholas is represented on Plate X, Fig. 

 28. This stone has been much changed by decomposition, and the character 

 of the original perforation is from this cause much altered in shape. 



Another specimen, now about 2 J inches in diameter, collected by Mr, 

 Bowers on the island of Santa Rosa (P. M. 13809), is so much weathered 

 and decomposed as to make it impossible to decide upon its original shape, 

 which may possibly have been globular. 



From the island of San Miguel Mr. Bowers obtained a small example 

 made of basalt and not much decomposed. A large fragment has been 

 broken from one side, and the fractured surface exhibits as much weather- 

 ing as the rest of the stone. This example is about 1 inch in thickness 

 and 1\ in diameter 



Closely allied to the several last described are some which consist sim- 

 ply of flattened and more or less oval pebbles of basalt, and other hard 

 rocks, that have been perforated by pecking the hole through from both 

 sides. Stones of this class may have been used as sinkers, and they seem 

 to be better adapted for that purpose than for any other of the several uses 

 attributed to the various forms of these perforated stones. 



The largest of these perforated pebbles measures 4 inches in its longest 

 diameter and 2 inches in thickness. The hole is 2 inches in diameter meas- 

 ured across its ends, and 1^ inches in the centre. It was obtained at the 

 island of San Miguel by Mr. Bowers (P. M. 13692). A similar stone, but of 

 smaller size, is from San Nicholas Island, and was collected by Mr. Schu- 



