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 PavlovAbout author
- Author's profession: Psychologist
- Nationality: russian
- Born: September 14, 1849
- Died: February 27, 1936
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I've known rivers: I've known rivers ancient as the world and older than the flow of human blood in human veins. My soul has grown deep like the rivers. I bathed in the Euphrates when dawns were young. I built my hut near the Congo and it lulled me to sleep. I looked upon the Nile and raised the pyramids above it. I heard the singing of the Mississippi when Abe Lincoln went down to New Orleans, and I've seen its muddy bosom turn all golden in the sunset. I've known rivers:...
Langston Hughes