155 years ago today, January 13, 1870 (December 12, 1869 in the lunar calendar), American biologist Harrison was born. On January 13, 1870, American biologist Harrison was born. In 1907, Harrison successfully cultivated tadpole tissue and grew nerve fibers from the tissue. This experiment not only introduced cytological research into observing living bodies, but also resolved the debate at the time about the origin and nature of nerve fibers.