Quassia Cups are goblet or tumbler shaped vessels made of quassia wood.  They range in size from about three to six inches high.  Quassia or Bitter Wood was first discovered in Dutch Guiana in 1763.  The wood was initially obtained from a shrub growing in Guiana but was eventually superseded by the wood of a tree indigenous to Jamaica.  Water allowed to remain in the cup overnight was used as a bitter tonic and to reduce fever.  Quassia cup displays could be found on the counter of many drug stores well into the 20th century.