1. hypnology   sleep   family histories and ancestries   heart with its functions and diseases   elements with their properties and reactions   Hint Half-n-half Clue   2. mycology   secret writings   fish   fungi and related diseases   production and application of low temperatures   Half-n-half Clue   3. criminology   heavenly bodies and phenomena in space   words with their origin and history   criminals and crimes   very minute living organisms   Half-n-half Clue