Excerpt from Light Science for Leisure Hours, Second Series: Familiar Essays
The First Series of Light Science Essays met with a success so far beyond my expectations, that I should have found in that circumstance alone a reason for adding the present volume to the series. But I have also felt a wish to publish these essays because they contain facts collected at the cost of much labour and carefully discussed, - useful, therefore, I trust, to others as well as to myself when thus gathered into a volume.
Those who have read my former series of essays, viz., 'Light Science, Series I.,' 'The Orbs around us,' and 'Essays on Astronomy,' will perceive that even when I treat here of subjects already dealt with by me elsewhere, I have been careful to avoid the repetition of any statements, except those few without which a subject would be incomplete.
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