| Cyrus Lanthier |
I guess those were perceived to be too "special?" They can't have the whole list of Alchemist discoveries *and* their own, after all.
All that being said, if you're playing in a home game, go ahead and allow them (especially on a spiritualist?), but them into plot hooks. To learn about mummification you've got to go somewhere where they know about mummies, presumably raiding tombs or the like (which is what the investigator ought to be doing, anyway) - I wonder what hazards you might encounter in such a tomb... :p