1. Chapman, V. J... “Seaweeds and Their Uses,” Methuen & Co., London, 1950.
2. Webb, D. A... “Spectroscopic analyses of marine invertebrates with special reference to the composition of their environment,”Sci. Proc. Roy. Dublin Soc., 1937,21, 505–39.
3. Cornec, E... “Spectrographic studies of the ash of marine plants,”Comp. Rend. Acad. Sci., Paris, 1919,168, 513–14.
4. Jones, A. J... “The arsenic content of some of the marine algæ,”Pharm. Jour., 1922,109, 86–87.
5. Williams, T. and Whetstone, R. E. “Arsenic distribution in soils and its presence in certain plants,”Tech. Bull. U.S. Dept. Agri., 1940,732, 1–20.