Excerpt from Color-Vision and Color-Blindness: A Practical Manual for Railroad Surgeons
For a long time the theoretical problem of color blindness has engaged the attention of the scientific world. The practical side lay dormant for many years until it was proved that this curious defect was the cause of disastrous accidents by rail and sea. Public attention became aroused, new and simpler methods of investigation were invented, and, as a result of much agitation, many railroad and steam-ship companies now require their employ s to submit to an examination as to their color-sense. Wilson in England, Helmholtz and Seebeck in Germany, Favre in France, Holmgren in Sweden, and Jeffries and Thomson in America have done much to stimulate this most necessary reform.
The methods now employed have proved practical and efficient, and there is every reason to believe that all the railroads in this country would take measures to weed out the color-blind from the service if the fre quenoy and dangers of this affection were brought to their notice. It is with the hope of stimulating further effort in this direction that this manual has been written.
The author does not aim to be original, but has endeavored to produce a practical work on color-blind ness which shall contain all that is essential to a perfect understanding of the subject, and to refer the reader to the proper authorities for many of the facts stated.
The author desires to tender his hearty thanks to Dr. James Thorington, of Philadelphia, for his many thoughtful and valuable suggestions.
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