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When this book was originally published in 1957 there had been lively debates on the air and in the press about the bearing of modern philosophy upon Christianity, but there had been relatively little sustained discussion of the subject. This book of essays was the product of a small group of Oxford philosophers and theologians, who had met and talked informally for some years before writing it. It is an attempt to discuss with care and candour some of the problems raised for Christian belief by contemporary analytical philosophy.

In asking the questions raised, this book makes...

The first book devoted exclusively to the spectroscope and its use in gemstone identification.

Until 1933 the refractometer and the microscope were the two principal tools in gem testing. Then B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. The publication of Anderson's papers in the mid-1950s alerted gem laboratories worldwide to the importance of this instrument. Today its use is universal.

Anderson and his lifelong colleague, Payne, both of the world's first full-time gemmological laboratory, were...

The first book devoted exclusively to the spectroscope and its use in gemstone identification.

Until 1933 the refractometer and the microscope were the two principal tools in gem testing. Then B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. The publication of Anderson's papers in the mid-1950s alerted gem laboratories worldwide to the importance of this instrument. Today its use is universal.

Anderson and his lifelong colleague, Payne, both of the world's first full-time gemmological laboratory, were...