In an appendix Dr. Bauer places Pearls and Coral.
Of
the authorities named as classifying gems, Bauer and Kluge are
manifestly moved by their scientific instincts, while Streeter was
actuated by popular demand, but responded to temporary conditions and
possibly, although maybe unconsciously, to personal interest.
The
final test of the rank of gems is their cost in the market, for that
tribunal is affected by every factor and influence in the case. The
five gems distinguished in this book as "the precious stones" far
outclass the gems in the long list that follows in the test of cost, in
which all their merits are considered and summed up.
