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Extract from beginning of chapter:

Looking back over forty years of petrographical work, from 1879 to 1919, in what might be called the first half-century of modern petrography, the writer [Iddings] has been interested to recall the dominant impressions made upon his mind by personal intercourse with many workers who took an active part in the development of the science during this period, and by the reading and study of their writings which bore directly upon his own particular lines of research. The framework of such reminiscences may well be constructed of the published results of his own research efforts and speculations. That is, the attempt by the writer to narrate the purpose or occasion, as well as the essential ideas, in several publications on petrographical and related subjects properly involves a consideration of the part played by his colleagues, directly or indirectly, in the formation of ideas or hypotheses held by the writer, and recognition of the extent to which his colleagues may have been responsible for the taking up of some particular problem.

It is interesting to note to what extent one may be indebted to others for suggestions both of petrographical conceptions and of lines of research, suggestions which may have been consciously or unconsciously conveyed by one's colleagues, and which may also have been consciously or only subconsciously accepted as such by the recipient. In many instances ideas are obtained through conversation or reading of others' writings, which are not definite at the time but develop and take shape subsequently.

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