THE ECONOMY OF THE EYES: PRECEPTS FOR THE IMPROVEMENT AND PRESERVATION OF THE SIGHT. PLAIN RULES WHICH WILL ENABLE ALL TO JUDGE SPECTACLES ARE BEST CALCULATED FOR THEIR EYES OBSERVATIONS ON OPERA GLASSES AND THEATRES, AND AN ACCOUNT OF THE PANCRATIC MAGNIFIER, FOR DOUBLE STARS, AND DAY TELESCOPES. Qui Visum, Vitam dat." BY WILLIAM KITCHINER, M.D. AUTHOR OF THE COOK'S ORACLE; THE ART OF INVIGORATING AND PROLONGING LIFE; THE LOYAL, NATIONAL, AND SEA SONGS OF ENGLAND. LONDON: PRINTED FOR HURST, ROBINSON, & CO. CHEAPSIDE; AND ARCHIBALD CONSTABLE AND CO. EDINBURGH. 1824. |