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(b) Shellfish toxicity in other areas. At the time of writing (4 August 1969) a total of 116 samples
of shellfish have been taken since March from 18 stations situated in areas of shellfish production
on the coasts of England and Wales, between the River Humber in the east and Morecambe Bay
in the west. Wherever possible, mussels have been taken, for these are among the most important
accumulators of toxin; in other areas only cockles, oysters and escallops have been available.
Toxin characteristic of that occurring in the north-east has not been detected in any of these
samples. However, the normal acid extracts prepared from certain shellfish (usually oysters)
have killed mice overnight, but without neurotoxic symptoms. This is believed to be caused by the
presence in the extracts of heavy metals, mainly copper and zinc, accumulated by the shellfish.
Tests are continuing.'
SECTION XV
MEDICAL INSPECTION OF ALIENS AND COMMONWEALTH IMIGRANTS
1. List of Medical Inspectors holding warrants of appointment at the 31st December, 1969 —
Dr W.G. Swann, Dr D.T. Jones, Dr. W.T. Rougier Chapman, Dr. G.W. Aston
Dr R.F. Armstrong, Dr. R.M. Best, Dr. H.M. Willoughby, Dr. J.A. Jones
Dr W.T.G. Boul, Dr. D.J. Avery, Dr. W. Stott, Dr. M.J. Catton, Dr. R.D. Summers
Dr. D. Jenkins, Dr. D.W. Keys, Dr R.G.S. Whitfield, Dr. A.E.L. de Thierry, Dr. J. Oakley
Dr. R.N. Herson, Dr. B. Dalton, Dr. W.N. Whiteside, Dr, H C Maurice-Williams
Dr, G.J. Leyden, Dr. D P. Rough, Dr. J.F. Buckley, Dr. D.J.R. Walters Dr. R. Tilley.
2. Other staff engaged on the work:Clerical
staff at the central office.
3. Organisation of the work:—
Aliens and Commonwealth Immigrants are examined by one of the above panel of doctors at
the request of an Immigration Officer. The majority of ships carrying immigrants are dealt with
by the Boarding Medical Officers but a part-time Medical Inspector may be called in to deal with
a particular ship. Since the inception of the Commonwealth Immigrants Act the larger passenger
ships have been boarded at Ports of call prior to their arrival in London as noted below.
4. Aliens Arrivals
(a) Total number of arriving ships carrying aliens 2,197
(b) Total number of aliens —
(i) arriving at the port 38,808
(ii) medically examined 93
(c) Certificates issued 1
Commonwealth Immigrant Arrivals
(a) Commonwealth citizens subject to control 5,876
(b) Commonwealth citizens examined 364
(c) Certificates issued Nil

5. Medical examination of aliens and Commonwealth immigrants is carried out on board ship.
SECTION XVI
MISCELLANEOUS
Arrangements for the burial on shore of persons who have died on board ship from infectious
disease.
NO CHANGE
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