Show shell materials the overage average hen pitts ants three centa worth of oyster shell fi year and when it Is available she will lay iny about 30 more eggs a year than though it Is not provid provided ed the lien hen needs calcium carbonate for the egg begs shells it Is difficult for her to secure an ample supply of this from water and reeds feeds alone Poultry men long ago learned that taftt oyster shell shelf was about 09 pr cent pure pare calcium carbonate and when crushed v vi q readily aval available lable for the |