62 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. g2 



The analyses were made as follows : 



The arc spectra of cleaned portions of the three specimens burned on pure 

 copper electrodes as a base were photographed (Spectrogram No. R 613 ab) 

 and the spectra were examined for the sensitive lines of Ag, Al, As, Au, Ba, Be, 

 Bi, Ca, Cb, Cd, Co, Cr, Fe, Ga, Ge, Hf, Hg, In, Ir, K, Li, Mg, Mn, Mo, Na, Ni, 

 Os, Pb, Pd, Pt, Re, Rh, Ru, Sb, Si, Sn, Sr, Ta, Th, Ti, U. V. W, Zn, and Zr. 



The elements found present and the comparative estimates of the amounts of 

 each are given in the following table. The qualitative scale used in designating 

 the amounts of the elements present, ranges from very small to large concentra- 

 tions as follows : faint trace, trace, very weak, weak, moderate, strong, very 

 strong. 



Attalyscs of Three Copper Pieces jrom J'ofizT Cache, Dixon Site 

 Element Cu (a) Cu (b) Cu (c) 



Ag Moderate Moderate Moderate 



Al 



As 



Au 



Ca 

 Co 

 Fe 

 Ga 

 In 



Mg 



Mn 



Ni 



Pb 



Sb 



Si 

 Sn 



In this class the numerous small stone objects found in the com- 

 plete ofifertory vessel will be considered first. Nearly all of these 

 are skillfully worked, and many of them by their green color and 

 polished condition suggest jade or jadeite. As a matter of fact no 

 artifacts from this site proved to be of these materials. The majority 

 of the small offertory pieces are of talc, including all the best carvings. 

 This material has a wide range of color, though green is the domi- 

 nating tone in the present collection. Apple-green is perhaps the 

 most common color, though olive-green, jade-green, apple-green with 

 dark flecks, turquoise-blue (rare), buff (often with a rusty brown 

 patination). grayish white, and gray-black artifacts of talc are pres- 

 ent. Talc is relatively soft and can be easily scratched. Beside talc, 



