the
center pearl and for the various groups and divide the price of the
necklace by this total ; the quotient will represent the multiple or
base. As may be seen by comparison of the first with the second and
third of the accompanying tables, the result arrived at in this way
will, if there is any difference in the weight of the pearls in the
various groups, vary slightly from that obtained by calculating the
weight of each pearl separately, but it represents a satisfactory
approximation.