On the other hand, Cruveilhier, also criticizing too wide a use of the term 'degeneration', wished to reserve it for that disordered activity of the organism that creates tissues that have no parallel in the state of health; such tissues, which usually present 'a fatty, greyish texture', are to be found in tumours, in the irregular masses formed at the expense of the organs, in ulcers or fistulas.