National Geographic : 1923 Dec
Photograph by II.Armstrong Roberts DRYING NETS NEAR THE VIRGINIA CAPES Important industries have arisen from the by-products of American fisheries. One of the oldest isthe fish-scrap industry, utilizing the offal for fertilizer and for chicken and cattle food. Fish oils, used in the manufacture of cheap soaps, lubricants, and paints; Cod-liver oil, valuable medic inally; North American isinglass, used in clarifying certain beverages, in making adhesives, India ink,and asizing for textile goods; glues and cements, are other by-products. Last year workers in Toronto University discovered that "insulin," prepared from thepancreas oftheShark, was useful as a palliative for diabetes.