Mind, Hallucinogens and the I Ching  
 
Terence & Dennis McKenna. 
 
The Seabury Press: 1975. First edition. Hardcover in a jacket. Octavo. Shelfwear and small tears along the edges of the jacket, and a few scuffs and tears not on the edges but close to them. Some foxing on the inside of the jacket. Smudges on the back cover of the jacket, especially along the crease of the spine. Dings on the edges of handsome blue buckram. Some foxing and smudging on the edges of the textblock. Ex libris stamp on the attached endpaper. 242 pages. Very good. 
 
Terence McKenna's first book. Here the McKenna brothers are young intellectuals thrilled to pair their ethnobotany bona fides with world-historical speculation. You get the introduction of ideas behind the Terrence sensation: the time wave (from the numerology of the I Ching), the unification of theory of mind and physical world, and of course how psychedelics change consciousness, not just subjectively but down to the molecular level. 
 
"In our own subjective experience, during the experiment and since, these categories have tended to migrate toward each other, leading, as we anticipated, to an understanding that seems to hover at the very edge of language while being clearly rooted in the sphere of cognition."