< Page:The wonders of optics (1869).djvu
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or absent friends with his mind's eye, or even fantastic
figures which have nothing to do with the train of thought he may be pursuing. It is with these involuntary apparitions as with spectres of the imagination: although they are intimately connected with some thought that has passed through our mind unperceived, it is impossible to trace a single link of the chain connecting them together.
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