Table XVI.
1935 1936 1937 1938 1939 Average for period To Straits Settlements 102,674 101,499 165,177 61,405 30,170 92,185 Total to all ports 158,300 164,077 245,488 124,186 80,611 154,532135. The fumigation bureau of the port health authority is responsible for disinfecting ships and ridding them of rats. Deratization certificates and deratization exemption certificates numbered 109 and 110 in 1939, as compared with ninety-one and eighty-eight in 1938. The details of the methods employed in the disinfection and disinfestation of ships are given in the report of 1937.
136. Sanitary control of aerial traffic is enforced under the Quarantine and Prevention of Diseases Ordinance, No. 7 of 1936, and regulations governing aircraft which were issued in 1937.
137. Six companies make regular calls at Hong Kong. No cases of infectious disease were discovered in passengers or crews arriving by air, nor were any reports received of such illnesses occurring in persons who had left Hong Kong by air.
138. This table gives details of Hong Kong's air-traffic:-
Nationality of aircraft Arrivals Departures Aircraft Passengers Crew Aircraft Passengers Crew American 42 420 336 42 386 336 British 145 276 290 148 315 296 Chinese 236 2,436 950 237 1,462 954 French 52 468 210 54 383 218 German 4 11 20 4 4 20 Total 479 3,611 1,806 485 2,550 1,824V. MATERNITY AND CHILD WELFARE.
139. The Colony provides 390 maternity beds but the majority of cases are accommodated in private maternity homes which are periodically inspected by the supervisor of midwives who is a qualified lady medical officer. Ninety-four inspections were carried out during the year and, while many homes were found not to be entirely satisfactory, it can be recorded that much improvement has resulted from the supervisor's visits and recommendations.