From Napa County, Calif oi 



20- 



rough-stone one of the Knight's valley collection, are in the Mu- 

 seum of the University of California. 



Obsidian in pieces and chips are abundant at each of the sta- 

 tions, though more so at A than the others. The number of 

 arrow-heads, and fragments of arrow-heads, collected principally 

 at A, numbered about two hundred, of which one-third were 

 found by my companion, Mr. A. L. Roach, of Indianapolis. A 

 few were obtained by other parties. With occasional exceptions, 

 the arrow-heads were in the rough stage of manufacture, awaiting 

 critical selection and finishing by experts in this line, probably 

 the veteran Nimrods of the tribe. 



by the 

 '-makers of this region ; none other was detected 

 among the debris or remains of their long abandoned workshops. 

 On the opposite side of Napa valley t in a hill not far from the 

 town of St. Helena, obsidian is found in great abundance, and it 

 improbable that from that locality the supply was obtained. About 

 one-third of the arrow-heads were found at station B; the forms 

 of these are shown in the above figures. 



