Correspondence. October 1956. COMMANDER T. A. BOUSTEAD, R.N., COMMANDER H. F. WAIGHT, R.N., CAPTAIN B. S. BLANCHFORD, R.N. Note: A letter, appearing in 'Correspondence' under the title ' Notes from Sea ' in Vol. 9, No. 3 page 420 appears signed ' C. H. Carsland '. The namz should read ' C. H. Carslaw '. The Editor apologizes for the error.