5 books
Civilization
On the Negative and Positive Phototropism of the Earthworm Allolobophora Ftida (Sav;) As Determined by Light of Different Intensities (Classic Reprint)
Studies in the Nature of Truth
On the Negative and Positive Phototropism of the Earthworm Allolobophora Foetida (Sav.)
Contemporary American Philosophy