What's inside a clam? A retractable foot ... that's encased in a shell made of two valves, or hinging parts. And that shell comes in all different sizes. There are small clams, like these ...

The common clam shell (Venus mercena-ra)—100 parts of the dry unburned shell gave of Silica.....none. Phosphates of iron, lime, and magnesia l'25O Carbonate of li"i . . . . 69 204 Sulphate of ...

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