I can’t believe I’m the only one with this exact reference. This is beyond all question a reference to LSD.
Consider this line…
“Should I try to do some more 25 or 6 to 4?”
Read it as “Should I try to drop some more acid?”
Here is my proof:
In the movie Captain Newman, MD (1963), Gregory Peck injects a patient with a drug, and there is close up of the bottle. The label says “Lysergic Acid Diethylamide, 25 or 6 to 4” I have seen this scene at least three times.
It is not totally clear what the term means. 25 is easy to explain:
The term LSD comes from the initials of the German for lysergic acid diethylamide, or Lysersäure Diethylamid. The number “25” following it has many myths attached to it, such as it was the 25th form of LSD that Hofmann tried, or it was his 25th attempt to make LSD. From my own experience with chemical companies that are allied with pharmaceutical houses, I had assumed that the chemical name (which might be a mouthful for the pharmacologist) was simply replaced with a pronounceable code number equivalent. But the answer here is yet simpler. Hofmann, in his LSD, My Problem Child wrote: “In 1938, I produced the twenty fifth substance in a series of lysergic acid derivatives: lysergic acid diethylamide, abbreviated LSD-25 … for laboratory usage.”
But then at the same document we find a possible clue:
“Within a few years of the discovery of the extraordinary potency of LSD, a large number of close analogues were synthesized by Hofmann and his allies at Sandoz. Over the following decade many were tested in humans, both in patients and healthy subjects, with the qualitative descriptions and dosages published in the medical literature.”
I think this was such an experimental drug at the time of the movie that the term may actually refer to a dosage, see this:
Delysid (LSD 25) D-lysergic acid diethylamide tartrate …
INDICATIONS AND DOSAGE
a) Analytical psychotherapy, …The initial dose is 25 µg … This dose is increased at each treatment …
b) … In normal subjects, doses of 25 to 75 µg re generally sufficient to produce a hallucinatory psychosis (on an average 1 µg/kg body weight). In certain forms of psychosis and in chronic alcoholism, higher doses are necessary (2 to 4 µg/kg body weight)