When one advocates a viewpoint, he generally proceeds by bringing to bear those aspects of the matter which will reinforce his Position. In these anecdotes, the viewpoint being considered is the evolution in our understanding of the nature of light. It is, therefore, appropriate to consider how men discerned those properties of light that led to an understanding. It would be remiss of me, however, to suggest that observations followed in an orderly manner until the nature of light became evident. Indeed, there are many manifestations of light that tend to obscure rather than to illuminate (if you will pardon my selection of that word) our understanding of light. It is of interest to consider some of the observations that tended to obscure our understanding.
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