Show TO TEST FOOD to test milk polish an ordinary knitting needle with emery cloth and dust it IL thrust it into the milk and withdraw it it if the milk be of average quality it will form a white greasy coating to the needle whereas it if deficient in fat that is watered the needle will look as though dipped in milky water coffee velch Is suspected of 0 containing chicory may be sprinkled on the surface of a glass of clear water coffee floats while the chicory being heavy sinks leaving a brown trail through the water chicory is soft to the touch and will crumble between the fingers unlike the hard gritty particles of coffee As is well known preserved peas very often contain considerable quantities of copper in order to preserve the green color of the peas the liquid in which the peas are packed Is emptied aitto a clean narrow glass a slender flower vase will serve the purpose admirably and about a salt spoonful of lemon juice is added a well polished knitting needle is allowed to remain in the glass over night might it will then them as tar far as the liquid reaches be coated with bright brown n metallic iet allic copper tea is often mixed with other leaves metallic substances such as iron manganese or sand to increase the weight or facing coating the leaves with indigo or prussian blue to make them green soak the leaves in water and anro unroll 11 on a glass and examine with a microscope the construction of a tea leaf Is so different from any other leat leaf it may readily be distinguished bruise some tea and cut up then pass a magnet over it particles of metal will cling to the magnet it if a teaspoon lul fill ot of tea which Is colored is thrown in water which is warm part particles cles of 0 indigo it if it has been used will w I 1 11 sink to the bottom of the glass |