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Salt is a great preservative; advantage is taken of this in salting meat and fish.

Other salts—lime, phosphorus, magnesia, potash, sulphur, and iron—are obtained in sufficient quantity from food we eat and water we drink. In young children, perfect formation of bones and teeth depends upon phosphorus and lime taken into the system; these are found in meat and fish, but abound in cereals.

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Starch is a white, glistening powder; it is largely distributed throughout the vegetable kingdom, being found most abundantly in cereals and potatoes. Being a force-producer and heat-giver it forms one of the most important foods. Alone it cannot sustain life, but must be taken in combination with foods which build and repair tissues.

Test for Starch.

Starch is insoluble in cold water, and soluble to but a small extent in boiling water. Cold water separates starch-grains, boiling water causes them to swell and burst, thus forming a paste.

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Glycogen, animal starch, is found in many animal tissues and in some fungi. Examples: in liver of meat and oysters.