Since writing the above, I have received, by the medium of the twopenny post, a printed circular, headed, “_Amber Spectacles._—M——having experienced from the use of amber spectacles that which is expressed by the following eminent gentlemen, considers it to be his duty to caution the public against the use of them:— “Amber is a soft substance, and it is impossible to form it into a perfect lens, and a lens improperly constructed would prove most injurious to vision. Amber, in a moderate heat, becomes sticky; and by cleaning it in a short time, the polish wears off. It is also easily scratched, and soon loses the little transparency it possesses. Glue, as to substance and colour, is quite equal to it; and although purchasers pay an enormous price for amber spectacles, yet they incur a great risk of materially injuring their vision.”[9] If there even were any merit or superiority in amber spectacles, be it observed, that the persons who prate about _their_ discovery, are not the parties who originated or introduced the article. I have in my possession several which were first brought to this country, and sold by a Prussian mechanic, long before he came in contact with individuals, who took a shameful advantage of his forlorn situation, and, after deluding him with specious promises, reduced him to their own terms. The poor man found remonstrances to be unavailing; and as he knew that redress was both uncertain and expensive, he refrained from farther interference, sighing as he said,— “My poverty and not my will consents.” Cautions respecting amber spectacles have frequently appeared in the daily newspapers. On the 17th of APRIL, 1838, the “_Sun_” contained a long advertisement, lauding their extraordinary virtues. In the same page, followed an exposé of the puff; and in another part of the paper was the following paragraph, made to appear as the editor’s remarks:— “An advertisement appeared in our paper of the 9th instant, calling into question the merits of patent amber spectacles, which have been so highly recommended for the preservative and assisting qualities for defective vision, by men of high character and professional reputation. The names of Messrs. Dollond and Curtis being used, it is right that the public should be apprised of the ascertained fact, that it owes its insertion, not to the knowledge of those gentlemen, but to the personal pique of interested individuals.”