A spectrum of the cool dwarf star PC0025 + 0447 obtained with the Low
Resolution Imaging Spectrograph at the Keck telescope yields an upper
limit on the lithium to hydrogen ratio. The limit is temperature depen
dent and ranges from 5 X 10(-10) for an effective temperature of 2500
K to 1 X 10(-10) at 1900 K. A definitive spectrum of the star's chromo
spheric emission is presented, but the prominence of the Balmer series
is due to the weak thermal emission of the photosphere, rather than e
xtraordinary activity. PC0025+0447 seems more likely to be a cool main
sequence star than a young brown dwarf.