Columbia subject headings:
Alkaloids.
Chemistry, Physical and theoretical.
Color.
Geysers.
Osmosis.
Steam.
Harvard subject headings:
Alkaloids.
Chemistry, Physical and theoretical.
Color.
Geysers
Osmosis.
Steam
Princeton subject headings:
Alkaloids.
Chemistry, Physical and theoretical.
Color.
Geysers--Iceland.
Osmosis.