"Unhappily, my laboratory had excited the suspicion of many ill-disposed persons among the low mob of the neighbourhood. It was whispered abroad that I was what they called a vivisectionist; and these people, who would willingly have attended a bull-baiting or a prize fight, found themselves of a sudden wondrous humane when scientific procedure was under consideration. Besides, I had made myself unpopular by receiving visits from my friend Dr. Priestley, whose religious opinions were not satisfactory to the strict orthodoxy of St. Giles's. I was rumoured to be a philosopher, a torturer of live animals, and an atheist. Whether the former accusation were true or not, let others decide; the two latter, heaven be my witness, were wholly unfounded. However, when the neighbouring rabble saw a drunken woman with a little girl entering my door, a report got abroad at once that I was going to vivisect a Christian child. The mob soon collected in force, and broke into the laboratory. At that moment I was engaged, with my assistant, in operating upon the girl, while several cats, all completely anaestheticised, were bound down on the boards around, awaiting the healing of their wounds after the removal of tumours. At the sight of such apparent tortures the people grew wild with rage, and happening in their transports to fling down a large bottle of the anegeiric, or reviving mixture, the child and the animals all at once recovered consciousness, and began of course to writhe and scream with acute pain. I need not describe to you the scene that ensued. My laboratory was wrecked, my assistant severely injured, and I myself barely escaped with my life. "After this _contretemps_ I determined to be more cautious. I took the lease of a new house at Hampstead, and in the garden I determined to build myself a subterranean laboratory where I might be absolutely free from intrusion. I hired some labourers from Bath for this purpose, and I explained to them the nature of my wishes, and the absolute necessity of secrecy. A high wall surrounded the garden, and here the workmen worked securely and unseen. I concealed my design even from my dear brother--whose grandson or great-grandson I suppose you must be--and when the building was finished, I sent my men back to Bath, with strict injunctions never to mention the matter to any one. A trap-door in the cellar, artfully concealed, gave access to the passage; a large oak portal, bound with iron, shut me securely in; and my air supply was obtained by means of pipes communicating through blank spaces in the brick wall of the garden with the outer atmosphere. Every arrangement for concealment was perfect; and I resolved in future, till my results were perfectly established, that I would dispense with the aid of an assistant.