Published online by Cambridge University Press: 11 February 2009
The notes that follow are concerned with certain mineralogical problems which could not be discussed at length in my edition of the De Lapidibus (Oxford, 1965). For the most part, only the bare conclusions are stated there.
In handling these problems I owe much to the discussions that I had during his lifetime with Dr. Stanley Smith, and to those that I have had more recently with Professor F. Coles Phillips and Mr. Robert H. S. Robertson.
1 The translation is mine, from vol. x (Loeb Classical Library).