To conclude I would like to repeat a few points. New crops have been established in our economy in the past, and will likewise be established in the future. As time progresses, each new introduction will be made with greater difficulty, the chief obstacles being the morphological characteristics and developmental patterns of the species involved. Economically speaking the early developmental stage will be most critical, when the plant product is almost established in the market, when farmers are hesitant to grow it, when industry or governments must give it a helping hand. New crops of greatest interest will be those of potential use to industry, those yielding pharmaceuticals, those to populate range areas, and those involving the lower organisms. In the society of our agricultural crops new crops are the pioneers. Their road will be more difficult than that of the established crops, but more exciting too.