These remarks are not made for the purpose of decrying in any way the merits which these preparations may have but only to illustrate a very marked tendency on the part of many people to attribute extreme virtues to ordinary food substances which are sold under attractive and sometimes deceptive names and whose properties and virtues are advertised in an expert manner. Because a food substance consists almost wholly of pure protein is no indication whatever of its exceptionally high food value. Protein is only one form of food and a concentrated ration of protein in any of these forms is just as likely to do harm as good. For emergency rations, for economy in transportation, and for certain diseased conditions of the digestive organs these preparations are undoubtedly valuable, but they have little claim upon the general public in a state of health as staple articles of diet. They are much more nutritive than the extracts of beef and other meats which have obtained a vogue wholly out of proportion to their dietetic or medicinal value. (“Foods and Principles of Dietetics,” by Robert Hutchinson.) PART V. CEREAL FOODS. BARLEY (GENUS _Hordeum_). In the United States barley is not used to any extent as human food. It has all the nutritive properties of the common cereals and may be considered as a food product, although its chief use is in the making of fermented beverages which will be described in full in the second volume. Barley is cultivated chiefly in the northern and western portions of the United States and is similar to the oat in this respect, that when the grain is threshed by the ordinary process the first layer of chaff is not separated, and, therefore, it goes into the market unhulled. There are varieties of naked barley which are not much cultivated. The cultivated varieties (_Hordeum sativum_ Pers.) belong practically to one species, although there are very many different varieties grown. The character of barley best suited to malting will be discussed in the second volume. _Acreage and Yield of Barley._--The area planted to barley in the United States and other statistical data relating thereto for the year 1906 are as follows: Acreage, 6,323,757 Yield per acre, 28.3 bushels Total production, 178,916,484 „ Price per bushel, 41.5 cents Value of crop, 74,235,997 dollars =Composition of a Typical Unhulled Barley.=--From a comparative study of a number of samples of American barley the following numbers are regarded as typical of the composition of the unhulled barley grown in the United States: Weight of 100 kernels, 4.53 grams Moisture, 10.85 percent Protein, 11.00 „ Ether extract, 2.25 „ Crude fiber, 3.85 „ Ash, 2.50 „ Starch and sugar, etc., 69.55 „