[An evocation of Pasteur].

This work is a very summarized Louis Pasteur's biography. As a scientist he discovered the dimorphism of the tartric acid crystals, the fermentation of several compounds (beer, wine, vinegar, butter) and how to avoid them thru the pasteurization, he also discovered the bacterial cause of many diseases of man and animals, changing the ways of human life. Thru sterilization, since him, the fatal outcome of many patients is avoided and surgery was made safe. He established bacteriology and immunology as branches of medicine and biology.