Duffin, C.J.; Moody, R.T.J.; Gardner-Thorpe, C. (2013). A History of Geology and Medicine. Geological Society London: Geological Society special publication. Geological Society. стр. 336. ISBN978-1-86239-356-1. Приступљено 1. 5. 2019.
Shelley, Mary. "Introduction" Frankenstein (1831 edition) Gutenberg "Many and long were the conversations between Lord Byron and Shelley, to which I was a devout but nearly silent listener. ... They talked of the experiments of Dr. Darwin, (I speak not of what the Doctor really did, or said that he did, but, as more to my purpose, of what was then spoken of as having been done by him,) who preserved a piece of vermicelli in a glass case, till by some extraordinary means it began to move with voluntary motion." [underlining added]