The train of thought which occupied him during this long trudge was to remain fixed in his memory; in any survey of the years of pupilage this recollection would stand prominently forth, associated, moreover, with one slight incident which at the time seemed a mere interruption of his musing. From a point on the high-road he observed a small quarry, so excavated as to present an interesting section; though weary, he could not but turn aside to examine these strata. He knew enough of the geology of the county to recognise the rocks and reflect with understanding upon their position; a fragment in his hand, he sat down to rest for a moment. Then a strange fit of brooding came over him. Escaping from the influences of personality, his imagination wrought back through eras of geologic time, he
