The Description of the Human Body He believed the heat of the heart somehow caused all movement of the body. Blood vessels he realized were pipes, he saw that veins carried digested food to the heart. (This was brought further by William Harvey. Harvey developed the idea of the circulation of the blood.) Descartes felt that an energetic part of blood went to the brain and there gave the brain a special type of air imbued with vital force that enabled the brain to experience, think and imagine. This special air then went through the nerves to the muscles enabling them to move. The Description of
And to Think That I Saw It on Mulberry Street heart on sight", and "as original in conception, as spontaneous in the rendering as it is true to the imagination of a small boy." Moore sent a copy of the book to English children's author Beatrix Potter, who wrote back, "What an amusing picture book ... I think it the cleverest book I have met with for many years. The swing and merriment of the pictures and the natural truthful simplicity of the untruthfulness ... Too many story books for children are condescending, self-conscious inventions—and then some trivial oversight, some small incorrect detail gives the whole show away. Dr. Seuss