[16] When the eyes are distressed and overwhelmed with light, _any_ shade or screen is viewed with satisfaction. Coloured glasses “soften the light” more naturally, and present to the eye equal and parallel surfaces: parasols, veils, and even opaque substances, may thus be said to shield the eye, and “modify bright and strong light,” but it would be as ridiculous to consider these as fit mediums for the ordinary purposes of vision, as it is to select amber for the purpose. Transcriber’s Notes pg 43 Changed: and the eminent individval himself to: and the eminent individual himself pg 45 Changed: ground in a pecular manner to: ground in a peculiar manner pg 45 Changed: the only real original manufacter of them to: the only real original manufacturer of them pg 49 Changed: received from the first familes to: received from the first families pg 60 Changed: charge according to the gullibilty of his dupes to: charge according to the gullibility of his dupes pg 61 Changed: being to expose a system of villany to: being to expose a system of villainy pg 62 Changed: The Royal Opthalmic Hospital, in Moorfields to: The Royal Ophthalmic Hospital, in Moorfields