Contributions to the discussion that followed Alfred Yarrow's paper 'Boiler construction suitable for withstanding the strains of forced draught, so far as it affects the leakage of boiler tubes.' By Mr. Durston, Chief Engineer of the Navy, Mr. Henwood, Mr. Morcom, Mr. Thornycroft, Mr. F. C. Marshall, Mr. Manuel, Mr. W. H. White and Professor Lambert.