Although sensitivity
in plants is slight as compared with that manifested in animals, within their
own kingdom they have sensitivity and vegetable spirit. Cut across a conical
shape, sprinkle a little sulphate of copper on it, add a little water and then
observe it with a magnifier. You will find its components rushing toward the
center. Their sensitivity is apparent in their effort to reach the center until
they form a cylinder.
- 'Abdu'l-Baha (Words of ‘Abdu’l-Baha, October 5, 1912, San Francisco,
USA, recorded by Mahmud Zarqani; ‘Mahmud’s Diary’)