Chapter Six- Cleve Backster's Laboratory - A chapter in a web-based book by psychologist Ingo Swann. Deals with a trip made by Swann to Backster's laboratory and chronicles the first-hand experiment he witnessed.
Subtle Energy - An article in a web-based magazine by Paul von Ward Lightworks. Deals with Cleve Backster's mind-plant discoveries and the author's speculations about them.
Vignettes From the History of Plant Morphology - Articles about people, mostly Agnes Arber, who created unconventional theories about plant morphology.
Plant Articles by Judith Handelsman - A series of articles from various magazines. The second one has relevance primary perception discoveries, as it describes Handelsman's own experiences with the phenomenon.
Dark Corner - Plants Feel - Offers information on how plants can read human minds.
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