Commercial glucose, as was explained in Lesson IV, is made by treating starch with dilute acids, and its wholesomeness depends entirely upon the care with which this is done. Theoretically, glucose is a very good food. In practise it is somewhat risky because cheap chemicals used in its manufacture may leave harmful and poisonous substances in the finished product. The manufacture of glucose is an excellent illustration of the objections to man-made foods as compared with natural foods. When we eat grapes we know that we are taking one of the most important substances required in the life-processes in a perfectly pure, unadulterated and wholesome form. Science has taught man to manufacture the identical substance that is found in the grape from corn, which is a much cheaper product, but the temptation to economize for the sake of dividends, and to allow the commercial spirit to control in the manufacture of food products is always present. For this reason the manufactured article comes under suspicion, while the natural form we know to be "exactly as represented." The principal uses of glucose are for table sirups and confectionery. Pure glucose as an article of food lacks flavor; for this reason the usual method of manufacturing sirups is to mix glucose and some other form of sirup or molasses. [Sidenote: Sirups and molasses] The original sources of sirups, besides commercial glucose, are cane-sirup, made directly by evaporating the juice of the sugar-cane; maple-sirup, made from the pure maple-sap; sorghum-sirup, or molasses, from the juice of the sorghum-cane, which is grown extensively in the South and Central West; and last, yet perhaps most common, "New Orleans" molasses, which is the residue from the manufacture of cane-sugar. This may be very wholesome if taken from the first drippings of the crystallized sugar, but if taken from sugar refineries it contains chemicals that have been used in the refining and the bleaching processes, and is a very doubtful product. An excellent quality of sirup can be made in the home by adding to the brown sugar a certain quantity of water, and boiling down to the desired consistency. HONEY [Sidenote: Honey, man's only food from the insect world]