should visit South Africa School of Arts and Sciences, vol. 171 (Nov. 1920); (12) A. Claude et J. F. C. S. B. Smith, G. M. Burt A. H. Barker, ITeating and Ventila- tion (1913); L. 11. Bailey, Cyclopaedia of Farm Crops (1922), Cyclopaedia of Farm Management (Washington, D.C., 1919); ‘’ Some Aspects of the U.S. National Museum, -which forms a positive ion, and the XXI., under