* Comprising minerals, metals, salts and chemical elements like calcium, sodium, phosphorus, potassium, natrum, kalium, silicon, chlorine, iodine, fluorine, magnesium, zinc, sulfur, ferrum, cuprum, etc. These and other elements of clay also form the ingredients of a balanced diet essential for our nourishment. The animals whose meat and milk we take live on the vegetable world. The grain, vegetables, fruits and roots that form our food feed on the soil they grow in and absorb all its chemicals.