Sunflower seed meal protein was compared with sardine meal protein and supplemented casein in growth expts. with young chicks that were fed diets in which the sole amino acid source was one of these products, and in which the total protein (N X 6.25) content was 20%. The excellent growth and gain per gm. of feed consumed which were observed indicate that sunflower seed protein is a complete source of amino acids for the chick.