In many cases complete dissolution of the corpse is attempted by immersion in acids. There are acids that completely dissolve bone tissue and even clothing but circumstances usually reveal these crimes. Accessibility to such chemicals and procurement of such chemicals usually lead to a search. The search usually leads to the finding of bone fragments, identifiable by means of buttons, bits of jewelry, metallic dentistry and other bits of evidence which escapes or rather resists the acid effects. And now we get into some deep scientific water. It is actually possible by the exact and accurate dosage of a certain poison, over a long period, to produce death "by typhoid fever." This poison, a common and easily available one shows up like an electric sign when not scientifically administered. But when given in frequent and exact small quantities it produces every symptom of typhoid. Quite often the corpse is buried as a typhoid victim. In most of these "typhoid" cases the motive is insurance and the murderer encouraged by success in one case attempts others. Sometimes there are a score of victims. In practically all cases the murderer is convicted in the long run. The circumstances that usually bring about detection are doctors and nurses and neighbors. They will remember that the murderer was always quite enthusiastic about insurance. A nurse will remember that the murderer insisted on preparing the victim's food. Sometimes a druggist will remember selling some poison to kill a dog or as an insecticide. * * * * * There is, too, a gas that administered in exactly correct quantities will produce "tuberculosis." This gas kills instantly unless scientifically administered. A small quantity will cause the lungs to "rot" gradually bringing death in from five to thirty days with all the symptoms of rapid or "galloping" consumption. Doctors have so diagnosed such cases but circumstances usually bring the crime to light. First among these is that the gas is rare, ordinarily. It can be home-made but only by a chemist with a well-grounded knowledge. It would appear that, among poisons, the most powerful would be the hardest to detect. This because a small dose would leave less trace than a large one. It follows only in some cases. One very powerful poison absolutely defies detection. Another, and the most deadly poison known to man reveals itself instantly. This second poison perfumes the corpse and leaves it smelling with a fruity odor. Any doctor or chemist can identify it instantly regardless of how small the dose might have been.