collected between F and D shall have their _Red_ so much the more diluted, by how much the farther they are distant from F towards D. Now, because by the refraction in the _Cornea_, and some other parts of the eye, the sides of each Ray, which before were almost parallel, are made to _converge_ and meet in a point at the bottom of the eye, therefore that side of the _pulse_ which preceded before these refractions, shall first touch the _Retina_, and the other side last. And therefore according as this or that side, or end of the pulse shall be impeded, accordingly will the _impressions_ on the _Retina_ be varied; therefore by the Ray GACH refracted by the _Cornea_ to D there shall be on that point a stroke or impression confus’d, whose weakest end, namely, that by the line CD shall precede, and the stronger, namely, that by the line AD shall follow. And by the Ray KCAI refracted to F, there shall be on that part a confus’d stroke or impression, whose strongest part, namely, that by the line CF shal precede, and whose weakest or impeded, namely, that by the line AF shall follow, and all the intermediate points between F and D will receive impressions from the _converg’d_ Rays so much the more like the impressions on F and D by how much the nearer they approach that or this. From the consideration of the proprieties of which impressions, we may collect these short definitions of Colours: That _Blue is an impression on the Retina of an oblique and confus’d pulse of light, whose weakest part precedes, and whose strongest follows._ And, that _Red is an impression on the Retina of an oblique and confus’d pulse of light, whose strongest part precedes, and whose weakest follows._ Which proprieties, as they have been already manifested, in the Prisme and falling drops of Rain, to be the causes of the colours there generated, may be easily found to be the efficients also of the colours appearing in thin _laminated_ transparent bodies; for the explication of which, all this has been premised. And that this is so, a little closer examination of the _Phænomena_ and the _Figure_ of the body, by this _Hypothesis_ will make evident.