Cherry-laurel (Prunus laurocerasus, L.), appears to have become known in Europe toward the beginning of the 16. century. The aqueous distillate from the leaves has been used medicinally since the first half of the 18. century and its poisonous properties were repeatedly observed.1) The distilled oil is included in pharmacopoeias since 1780.2) The precence of hydrocyanic acid in the oil was observed simultaneously by Schaub3) and by Schrader4) at the beginning of 19. century.