Color blindness all variations in human color vision involve the red and green receptors in male eyes. It is very rare for males or females to be "blind" to the blue end of the spectrum. The first scientific paper on the subject of color blindness, "Extraordinary facts relating to the vision of colours", was published by the English chemist John Dalton in 1798 after the realization of his own color blindness. Because of Dalton's work, the general condition has been called "daltonism", although in English this term is now used only for deuteranopia. Color codes present particular problems for those with color
A Discourse on the Study of the Law A Discourse on the Study of the Law A Discourse on the Study of the Law is a treatise by Sir William Blackstone first published in 1758. On 20 October 1758 Blackstone had been confirmed as the first Vinerian Professor of English Law, and immediately gave a lecture on 24 October, which was reprinted as the "Discourse". The "Discourse" was designed to be a work on how to study English law, and the importance of doing so. Blackstone emphasised the advantages of a civilian legal education over the training for a call to the Bar, arguing for the inherent dignity