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These are not, of course, the results of experiments on human beings, but rather extrapolations, in which lower risk thresholds have been determined on the grounds of safety. This will be demonstrated in the following. To kill an average person with a body weight of 100 kg, the victim must therefore ingest approximately 100 mg hydrogen cyanide (1 mg per kilo body weight). The respiration of a human being at rest amounts to approx- imately 15 liters of air per minute.441 With a hydrogen cyanide content of 0.02% (approximately 0.24 mg per liter) the victim must inhale ap- proximately 416 liters of air before ingesting the fatal quantity of hy- drogen cyanide. At 15 liters per minute, this will take about half an hour. A very strong person can survive even this period of time. By contrast, a sensitive person weighing 50 kg breathing at an accelerated rate as a result of physical effort or excitement will inhale 40 liters per minute, ingesting a fatal dose of 208 liters of air in five minutes. It is obvious from these calculations that the data in safety instructions are always intended to protect smaller, weaker people from accidents under the most unfavorable circumstances. The data given in the literature as “immediately” or “rapidly fatal” doses are furthermore so indefinite as to be unable to satisfy our purposes. In addition, they only refer to the time when a victim has ingested a fatal dose, but not when death occurs, which can be considerably later.