Acting upon the Greek maxim, γνωθι σεαυτον, devoted his whole life to solving the mysterious problem of "what's what?" Yet he burst his boiler eventually, and, as he was accustomed with a melancholy facetiousness to remark, was seldom able to fill his own stuffing-box. He choked himself with a new roll, which was in consequence termed a penny buster. His great bust was the work of Chantrey. To him we owe the invention of the baked-tater can. His hymns have been much admired. NEWTON, The great inventor of the solar system, was descendant of the Earl of Orrery. He discovered the centrifugal force from watching the scenes in the circle at Astley's. Whilst seated in his usual place in the pit one night, he was hit on the head by an apple from the gallery, supposed to have been aimed at Widdicombe, which led him to the discovery of the gravity of the earth, though it destroyed that of the house. Yet this great man was in his old age reduced to keep an eating-house near Leicester Square, formerly called the Hotel Newton, but now better known as Berthollini's. DR. JENNER, Whilst in the incipient stages of small-pox, was tossed by a cow, which led him to the discovery of vaccination. Yet he was often without the means of procuring a ha'porth of milk; so that he was wont to say, when in a merry mood, that although his discovery had extirpated the confluent state, it had not left him in an affluent one. Cowes was his favourite residence, where he died in a state of monomania, fancying himself one of them. HARVEY, Invented the circulation of the blood; yet he composed his "Meditations amongst the Tombs" with no other stimulus than a bottle of his own sauce, during an excursion to Kensal Green. Ultimately, coming to poverty, he took the situation of Hermit, at Vauxhall, and lived upon pulse. His works are now only found at circulating libraries. PRIESTLEY, Although he discovered the properties of air, had not sufficient property of his own to raise the wind. He found out the composition of the atmosphere; but was unable to effect a composition with his creditors. During the "NO POPERY" riots his house was torn down by the mob, who said they would have "none of that _air_." He afterwards travelled about the country with lucifer matches, whence he has been erroneously termed a light porter. He died ultimately from want of breath, ungratefully deserted by that element which he had raised from obscurity, and left his discoveries as an _heir_loom to the nation. He died in a Wynd in Edinburgh, but his remains were afterwards removed to Ayr, where an humble admirer afterwards inscribed this terse but touching epitaph upon his tomb:— "Here lies Priestley. Whose treatment was beastly." DAVY (SIR HUMPHREY),