The author
has to acknowledge his indebtedness to E. C. Munro Ferguson, Esq.,
M.P., for permission to figure some of the very fine specimens of
Precious Stones contained in the Eaith Collection ; to Dr. J. B. Mears,
of Edinburgh, for his careful drawings and photographs of these
specimens ; to Mr. B. Dykes, of the Marine Biological Laboratory,
Lowestoft, and lately assistant to Sir J. Murray, K.C.B., for his
chapter on the artificial production of Precious Stones; and to the
life-teaching of his late father, J. G. Goodchild, of H.M. Geological
Survey. Among the numerous larger works on this subject the reader is
especially referred to the splendid book by Dr. Max Bauer, translated
by Mr. L. J. Spencer, of the British Museum.
The
different gem stones are here considered in a mineralogical sequence,
and the numbers preceding the names are the species numbers of Dana's
System.
WILBERT GOODCHILD.
THRELKELD,
(October 1907.
