MADRAS FISHERIES BULLETIN No. 7. PLATE VIE. 
Fig. 1.—RUBBING DOWN THE INNER SURFACE OF A CHANK WORKING 
SECTION, DINAJPUR, BENGAL. 
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Fic. 2..-FORMING A SIMPLE RIDGE PATTERN BY RUBBING DOWN THE 
SECTIONS ON A STONE, RANGPUR, BENGAL. 
[Photo. by J. Hornell. | 
