In cases such as have been described here readers might wonder why names, dates and places are not revealed. They might ask why scientific detectives desire the text to be vague. The reason is quite simple and understandable once it is explained. Even where conviction is obtained in such cases it is only after the most laborious and expensive processes and investigations. Living relatives of the accused in each case might be moved to bring suit on any of many grounds. This would result in more long, laborious and expensive litigation--to the Government, the writer, the publisher, doctors, detectives and what not? This thing has been going on for centuries. As far back as history records mysterious poisons have been a common means of murder. There are thousands of poisons. Some of these, products of the jungles held secret by savage tribes, are still little known to or understood by scientists. Poisons are given up by the earth, secreted by plants and by animals. They are produced by combining chemicals and by chemical reactions. In nature they are begotten by elemental distillation, by the action of the sun's rays, by the excrement of animals including the fishes, by the promulgation of minute organisms, and in a myriad of mysterious ways. Some of these processes are well understood and some little understood by man. As is the case with electrical and other forms of scientific research the field of scientific criminal detection hardly has been scratched. Research is constant and no doubt will be perpetual. No one knows where any sort of research will lead. Scientific detectives call attention to this fact: "Such research is valuable not only in the matter of law enforcement but might prove of inestimable value in other fields. It might lead to a discovery that would end cancer or one that would end war."