Bread
The first element is wheaten bread (panis triticeus), without which the "confection of the Sacrament does not take place" (Missale Romanum: De defectibus, sect. 3), Being true bread, the Host must be baked, since mere flour is not bread. Since, moreover, the bread required is that formed of wheaten flour, not every kind of flour is allowed for validity, such, e.g., as is ground from rye, oats, barley, Indian corn or maize, though these are all botanically classified as grain (frumentum), On the other hand, the different varieties of wheat (as spelt, amel-corn, etc.) are valid, inasmuch as they can be proved botanically to be genuine wheat. The necessity of wheaten bread is deduced immediately from the words of Institution: "The Lord took bread" (ton arton), in connection with which it may be remarked, that in Scripture bread (artos), without any qualifying addition, always signifies wheaten bread. No doubt, too, Christ adhered unconditionally to the Jewish custom of using only wheaten bread in the Passover Supper, and by the words, "Do this for a commemoration of me", commanded its use for all succeeding times.