M 88
In June, the Laboratory staff was made responsible for the chlorination of the emergency tanks which had been erected on the Praya, and for this work, 3 Inspectors from the Sanitary Department were attached to the Laboratory staff. A standard of 0.5 parts free chlorine per million was aimed at. Portable testing sets were made in the Laboratory and supplied to the Inspectors and an average of 150 tests made per day. That the chlorination was effective is shown by the fact that the daily tests made by the Government Bacteriologist showed, in every case, B. coli absent from 50 cc.
CRIMINAL WORK.
In January last, two pieces of cotton tape were submitted by the Police. These had been removed from a body at the Kowloon Mortuary. It was suspected that they had previously been used as part of a driving belt on a pulley in a barber's shop. Chemical examination revealed the presence of oily stains which tended to confirm these suspicions.
In the same month a cotton jacket was brought for an examination to be made of stains on the back. This had been worn by a man walking Shanghai Street who had been followed by two men. The latter had thrown a corrosive fluid over him. Chemical analysis showed the liquid present to be nitric acid.
The assistance of the Laboratory was sought in the investigation into the cause of the King Edward Hotel fire. Specimens of wax, wood, etc. were submitted for examination as to the relative inflammability of these materials. It was proved that the floor polish used did not render the woodwork more inflammable to any material extent.
In February, a considerable number of articles were received from an alleged counterfeiting plant. It was reported that all the articles submitted were such as would probably be used in the manufacture of spurious coins and the use of the individual articles and substances was described.
In December, a passport was submitted for the examination of certain erasures. The presence of the erasures was proved and an opinion given as to the nature of the writing there previously.
The toxicological investigations have already been referred to.
RESEARCH.
Work has been done during the year on the detection of seawater in cases of drowning. A number of cases have occurred in which samples of the stomach contents, of the blood or of fluid from the thorax have been submitted. The total chlorides
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Page 376
M 88
In June, the Laboratory staff was made responsible for the chlorination of the emergency tanks which had been erected on the Praya, and for this work, 3 Inspectors from the Sanitary Department were attached to the Laboratory staff. A standard of 0.5 parts free chlorine per million was aimed at. Portable testing sets were made in the Laboratory and supplied to the Inspectors and an average of 150 tests made per day. That the chlorination was effective is shown by the fact that the daily tests made by the Government Bacteriologist showed, in every case, B. coli absent from 50 cc.
CRIMINAL WORK.
In January last, two pieces of cotton tape were submitted by the Police. These had been removed from a body at the Kowloon Mortuary. It was suspected that they had previously been used as part of a driving belt on a pulley in a barber's shop. Chemical examination revealed the presence of oily stains which tended to confirm these suspicions.
In the same month a cotton jacket was brought for an examination to be made of stains on the back. This had been worn by a man walking Shanghai Street who had been followed by two men. The latter had thrown a corrosive fluid over him. Chemical analysis showed the liquid present to be nitric acid.
The assistance of the Laboratory was sought in the investi- gation into the cause of the King Edward Hotel fire. Specimens of wax, wood, etc. were submitted for examination as to the relative inflammability of these materials. It was proved that the floor polish used did not render the woodwork more inflam- mable to any material extent.
In February, a considerable number of articles were received from an alleged counterfeiting plant. It was reported that all the articles submitted were such as would probably be used in the manufacture of spurious coins and the use of the individual articles and substances was described.
In December, a passport was submitted for the examination of certain erasures. The presence of the erasures was proved and an opinion given as to the nature of the writing there pre- viously.
to.
The toxicological investigations have already been referred
RESEARCH.
Work has been done during the year on the detection of seawater in cases of drowning. A number of cases have occur- red in which samples of the stomach contents, of the blood or of fluid from the thorax have been submitted. The total chlorides
Page 375Page 376
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