For in Les Revolutions de la medecine the certain form of science is not defined by a type of calculation but by an organization whose values are essentially expressive; it is not a question of drawing up a calculation to proceed from the probable to the certain, but of determining a syntax in order to proceed from the element of the perceived to the coherence of discourse: 'the theoretical part of a science must, therefore, be the simple statement of the sequence of classification and of the relationship of all the facts which make up this science; it must, so to speak, he its summary expression'.