12 



MUSSEL RESOURCES OF THE HOLSTON AND CLINCH RIVERS. 



Powell River. The diameter of blanks is expressed in "lines" 

 (1 line= jV inch), and "T" in the columns indicates "tips," uneven 

 blanks of poor quality. 



Commercial Valuation op Mussel Shells Taken from Clinch and Powell 



Rivers. 



a Not stated. 



b Large. 



i Second grade blanks and tips. 



It will be noted from the above table that the same lot of shells 

 was in some cases tested for two sizes of blanks, as in the case of the 

 last lot of L. ligamentina gihha, or 3^ellow-back mucket, shown in 

 the table. The shells were first tested for 30-line buttons, and the 



