to him establishing the germ theory. He used microscopes for his research and experiments, and gave emphasis to sterilization. After a series of extensive experiments he discovered that yeast could live with or without oxygen and concluded that if no oxygen was provided the yeast took its oxygen from the sugar and caused fermentation. In short, Aristotle contributed towards the scientific method by using reasoning to formulate theories. Galileo used reasoning together with experimentation. Lavosier focussed on extensive calculations and mathematics in deriving principles. And as far as Pasteur is concerned, he used a combination of all these namely: reasoning, experimenting and calculations to base scientific theories. Thus in this way the present day scientific method was developed. ...
