It's also noted (in bold text, no less) that
Monks & Druids do not have psychic potential, they are therefore prohibited from becoming psychics.Again, I can see limiting psionics to certain classes but a universal prohibition does raise questions. For example, of all the classes available in OD&D, the monk strikes me as the one that's most compatible with the notion of psionics. Indeed, many of the class's abilities strike me as conceivably psionic in nature. So why the prohibition? And why are druids unable to be psionic while clerics can? It's an oddly specific ruling. No mention is made of paladins (who, presumably, count as fighting men) or assassins, nor of classes from The Strategic Review, even though rangers at least are referenced elsewhere in Eldritch Wizardry.
Needless to say, OD&D psionics are a lot more "quirky" than even their AD&D counterparts, which is saying something. Right now, I'm trying to figure out if there's any discernible logic behind these quirks or if they're just things that are. Regardless, I'm having a lot of fun plowing through this stuff.