Recalls meeting JH in 1840, introduced by R. C. Stewart of Bombay. Saw JH's letter on artificial production of ice in Year-Book of Facts for 1851 (p. 157). Describes WM's unsuccessful experiments with commercial powders in tropical climate. Asks for information about portable air compressors. Local surgeon, Dr. Porteus, whom JH met at Cape of Good Hope, asks to be remembered to JH's family.