170 PEARLS AND PEARLING 



Some nice rose colored pearls were found in the Ten- 

 nessee River in Alabama, which is a great iron district. 



The Cumberland River in Kentucky has produced some 

 very fine pink pearls. Above Cumberland Falls, The 

 Unio gibbosns, or lady-finger, is about the only variety 

 found, and the shells are pink. Farther down the river 

 the color of the shells gradually becomes lighter, but 

 shells are not taken in the first 175 miles of the river. 



From Celina down, the shells are whiter and larger 

 and "clamming" is carried on in many places. 



Kentucky contains deposits of iron, gold and silver. 

 Mineral springs are abundant in the hills. Salt is also 

 found there. 



Some very fine lavender pearls have been found in 

 Kansas. This State produces lead, zinc and salt. * 



Some very large pink pearls were found in the north- 

 eastern part of Arkansas, in the Black River, which 

 drains the Iron Mountain region of Missouri. 



Other pink pearls were found in Murphy and Walker 

 Lakes, both of which are known to contain iron. 



The pearl fisheries of Wisconsin have produced a large 

 variety of colored pearls. Among them are pink, red, 

 bronze, purple, lavender, and peacock green. This State 

 ranks high among the iron producing States, while lead, 

 zinc and copper are also found. The State also has valu- 

 able mineral springs. 



A careful comparison of the colors of the pearls found 

 in the various localities and the kinds of minerals which 

 are also found in the same places, leads to the conclusion 

 that the colors of pearls depend upon the kind of min- 



