The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the external surface of the body, but turned inwards and thus hidden in the organism.
Ivan PavlovMen are apt to be much more influenced by words than by the actual facts of the surrounding reality
Ivan PavlovScience demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching.
Ivan Pavlov