As far as I can remember, a scientist in this book invented something based on mescaline and the result was that he - and others who followed this procedure - recognized that people are being exploited by energetic monster creatures.

  • Mescaline has to be mixed with ether
  • Monsters were otherwise invisible to people, but they were separate entities, that is not living inside human mind as suggested in "The Mind Parasites" by C. Wilson.
  • 3
    When did you read this and where? In what language? There must be something else you remember about the plot as well - names of the characters, maybe?
    – Gallifreyan
    Jun 16 '17 at 13:35
  • I cannot remember much more; quite sure that was English literature. Well, after these creatures actually noticed you notice them they'd kill you.
    – J. Doe
    Jun 16 '17 at 14:29
  • 2
    Colfer's The Supernaturalist has blue energetic monster creatures that only very few can see (spoiler: for most of the book, appear to exploit humans, but are actually helping them). There was a scientist who tried to make others able to see them by causing threats to their safety, but IIRC there was nothing there about mescaline.
    – Shokhet
    Jun 16 '17 at 19:04
  • will read it as well :-) for now cannot tell if it was it, rather not.
    – J. Doe
    Jun 17 '17 at 12:47
  • @J.Doe: Because you responded to my comment, and because someone upvoted it, I posted it as a proper answer. For future reference, if you want someone to see a response to a comment, include their username, preceded by the @ symbol. (I didn't get a notification for your response; I just happened upon it.) I hope you find the book you're looking for :)
    – Shokhet
    Jun 18 '17 at 4:26

This looks like "The Mind Parasites" by Colin Wilson.

  • The protagonist is a scientist
  • He learns that the human minds are controlled by bodiless parasites which can in theory be seen but distract the host's attention when he tries to focus on them
  • He used mescaline to focus his attention on the parasites and eventually get rid of them
  • Now I have read and enjoyed "The Ming Parasites" very much, but I am also quite sure that despite some similarities it is not the one I am looking for. (e.g. the parasites where not inside the mind)
    – J. Doe
    Jan 30 '19 at 9:57

Colfer's The Supernaturalist has blue "energetic monster creatures" called "Parasites" that only very few humans can see. These monsters appear to exploit humans, sucking out their life force.

It is revealed toward the end of the book that they are actually helping humans, by alleviating the pain of the dying.

There was a scientist who tried to make others able to see them by causing threats to their safety, but, if I remember correctly, there was nothing in the book about mescaline.

  • The Supernaturalist has no main characters who are scientist-inventors. I'd be surprised if someone remembered Faustino or Myishi without remembering the gang of kids that the story is mostly about.
    – Rand al'Thor
    Nov 23 '17 at 10:48

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