The next great object which we are called to observe, is, the _Decay_ of _Sight—Those that look out of the windows_, _are darkened_. I believe none has ever questioned but this means the eyes, and the infirmities of them in old age. One may be said to look out of a window, when he looks through the glass of the window, or when he looks through the open casement. Now a man could not look through a window, if it was not made of glass, or something of the kind, neither could he perceive any thing with his eye were not the parts thereof which the passage is made of, the very same substance. The parts of the eye through whose bodies the visible _species_ must pass, that they may be discerned, are either the humours, or the tunicles; the humours are three, the watery, the chrystalline, and glossy humour, so Anatomists call them; and however they differ, yet they are all instrumental to vision. The tunicles or coats, through which the sight is made, are only two, though there are others which conduce to the sight, yet there are but two through which the beams of light pass; the first is as fine and curious as a Spider’s web, and being derived from the Brain and optic Nerve, it becomes a vestment for the humors, and is pellucid and transparent. The other is an hard and horny membrane, and encompasseth the whole body of the eye, without perforation, and on the back part, behind the sight of the eye is more obscure and dark, but on the fore part is far more plain and clear. Solomon observes these _lookers out of the windows to become dark_, that is, as age enfeebleth the eye the form and figure becomes more plane and depressed than it was before, and the chrystalline humor, which had a power of reducing itself, now becomes dry and altogether unfit for such an end, which must breed a confusion in the sight. As age comes on, and increaseth, it is well known the sight goeth away, the lookers out of the windows must be darkened. We have scarce any description in scripture of an old man and his infirmities, but the decrease of sight is mentioned, their eyes were dim, and they could not see. I hope you will pardon this very short description of the eye, as it is a very large subject, and a vast deal may be said open it, which I reluctantly omit, lest I should swell this letter to a volume.—Thus my dear friend, our poor bodies in sickness and age, are compared to an old house, with its teams, pillars, and windows, terribly shattered; condemned by the Parish to come down. But I cannot let this letter pass without the promise of another. May your confidence increase, and abound more and more in this blessed truth, _If this earthly house of our tabernacle is dissolved_, _we have a building of God_, _an house not made with hands_, _eternal in the heavens_—there may we meet.—Amen. I remain ever yours in Jesus, [Picture: Signature of J. C.] _LETTER VIII_.