All Artists choose a Room lighted only from one aperture—and if possible with the steady North aspect; that is the best place in the room, indeed the only proper place for Study for those who have any regard for their Eyes, where the Light falls on their work or bookcoming from the side or from behind.

"It is requisite always to have an equal, well regulated Light in every employment, particularly in the Evening; the Eye may be seriously strained and injured by working, writing, or reading with either too much or too little Light for want of a due attention to preserve the visual organ, and from using the Eyes very much during the busy part of life, a morbid sensibility is brought on, an unnatural weight of the Eye-lids, a great deficiency of distinctness, and occasionally a distressing, undulatory quivering appearance of refrangible colours on either side. To remedy this, washing the Eyes with clear cold water, and keeping them from the Light for an hour, or taking a Nap, will be found most efficacious."-S. PIERCE.

If your Eyes are much employed in Reading, &c. and are extremely irritable, you may have your window glazed with Green Glass, or a

blind of it to put up occasionally

or a rolling blind of Green Silk or Muslin—or have a plate of Green glass fixed in a Frame, which may be placed so that the Light may pass through it to your book or work. But do without all these if possible for if they alleviate the irritation while you use them - they will render the Eyes more morbidly irritable after.

AT NIGHT-use a Reading Candlestick or Lamp with a shade to shield the Eye from the glare of the Light;* which is of much greater assistance to the Sight than those who have not tried it can imagine: One candle so shaded will enable a person to see better than Two without such a shade, and with a Cumumbra Lamp-you may see I think almost quite as well as by Day-light, the sensibility of the Eye is preserved in such perfection.

The Optic Pupil inevitably adjusts itself to the brightest object, which therefore should

Every thing is best seen when the light of the candle is intercepted: the bright light of the Candle not only makes the pupil contract, but by mixing itself with the images of other objects, it in some measure obliterates them, so as they cannot be so well perceived."-Dr. PORTERFIELD on the Eye, 8vo. 1759, Vol. II. p. 188.

be that which it is its business to attend to, not the flame of a Candle, but the Book you are reading.

GREEN, or any COLOURED GLASSES, veil objects with a gloomy obscurity, and can never be recommended, except to those who have to travel over a white sand, or are much exposed to any bright glare, which cannot be otherwise moderated.

Light reflected from any white surface, is very piquant and injurious to the Sight, whether proceeding from Water-Snow, &c.

Gogglers or black cups, glassed with plain glasses, and mounted in double-jointed frames formed to the shape of the face-are preferable to those which are fixed in Leather and Silk and tied on with riband; the latter come so close to the face that they soon become a Vapour Bath for the Eye-but the former are occasionally found very serviceable to travellers to protect their Eyes from Wind and Dust, and to shield* them from a strong Reflected Light; Blue or

"Xenophon relates that many of his Troops were blinded by the strong reflection of the light from the Snow over which they were obliged to march.

"Dionysius the Tyrant of Sicily, among other means

Green glass may be fixed in them, but it must be of a very light Colour.

Some more nice than wise folks, among other ridiculous refinements have recommended thin Green-Gauze or Crape, instead of Green Glass

under the pretence, that while it moderates the Light, that it still admits the Air, and is, therefore, cooler to the Eyes.

All Coloured Glasses increase the labour of the Eyes, and soon bring them into such an irritable state as unfits them for all the ordinary purposes of Life: - there is scarcely an external or internal Sense, but may be brought by extreme indulgence, to such a degree of morbid delicacy and acuteness, as to render those organs which nature intended as sources of

which he took to gratify his revenge, and satiate the savage cruelty of his Temper, was accustomed to bring forth his miserable Captives from the deepest recesses of the darkest Dungeons, into white and well lighted Rooms, that he might blind them by the sudden transition from one extreme to the other.

"Actuated by principles equally barbarous, the Carthaginians cut off the Eye-lids of Regulus and then exposed him to the bright rays of the Sun - by which he was very soon blinded."-G. ADAMS on Vision, 8vo. 1789, p. 8.

gratification - the frequent sources of Disappointment and Pain.

The most proper material for Spectacle Glasses, is that which shews objects the nearest to their natural Colour.

Lastly - Whatever Glasses you use - take care to "keep them perfectly clean:" this is as important, as the choice of the Figure or the Colour of them.

Every time you wipe your Spectacles you scratch them a little, and "many a little makes a mickle" - therefore, when you have done using them, put them away carefully in their case, to prevent other people abusing themas a Naughty Boy did his Grand Pa's Spectacles - who took the Glasses out - and when the old Gentleman put them on-finding that he could not see, exclaimed," Marcy me, I've lost my Sight!"—but thinking the impediment to Vision might be the dirtiness of the Glasses

- took them off to wipe them—when not feeling them, he, still more frightened, cried out, "Why what's come now, why I've lost my Feeling too!"