A WOMAN with a history of mental illness was yesterday sent to a psychiatric hospital for an unspecified period for drowning her son after he refused to take a bath. Making the order against housewife Lung Fan-wa, 36, Mr Justice Stock said it was a tragic case and the person who would be most affected by it would be Lung herself. Lung was originally accused of murdering her son, Wong Siu-ming, who was a month short of his fifth birthday, at their Kwun Tong home but she denied the charge and pleaded guilty to manslaughter on the grounds of diminished responsibility. The plea was accepted by the Crown and the court. Senior Assistant Crown Prosecutor Peter Chapman told the court that Lung picked up the boy from kindergarten on January 23 last year and wanted to wash him because his hair was dirty. She filled a large basin with warm water and, when the child refused to take the bath, she dunked him in the water fully clothed. However, he continued to be unco-operative so she scolded him and used a ladle to pour water on his head. According to Lung, she shampooed him and pushed his head under the water for a few minutes before she found the boy had lost consciousness. Thinking that he had fainted, she put him on a wooden board on the floor, covered him with a blanket to keep him warm and, when there was still no response, she removed her own wet jacket, put it in the basin of water and went to sleep on the bed next tohim. When her 77-year-old mother-in-law returned home at around 4.15 pm, she found the boy covered with a blanket. She took off his wet clothes and wrapped him up with a dry towel before taking him to a hospital where he was certified dead at 6.35 pm after attempts at resuscitation had failed. Bruises and abrasions were found on the boy's head showing that a degree of force had been used on him and that the cause of death was drowning. Inquiries revealed that Lung had been receiving treatment since 1987 for psychiatric depression and a subsequent diagnosis of schizophrenia and that she had twice tried to commit suicide. On the day in question, she was scheduled to go to the United Christian Hospital for treatment before picking up the boy but she failed to go. Her counsel, Robert Forrest, said it was a very sad case and asked the court to follow the recommendation of the psychiatrists and send Lung to a mental hospital.