Conjectures have, indeed, been advanced concerning these habitations of literature, but without much satisfaction to the judicious inquirer. Some have imagined, that the garret is generally chosen by the wits as most easily rented; and concluded that no man rejoices in his aerial abode, but on the days of payment. Others suspect, that a garret is chiefly convenient, as it is remoter than any other part of the house from the outer door, which is often observed to be infested by visitants, who talk incessantly of beer, or linen, or a coat, and repeat the same sounds every morning, and sometimes again in the afternoon, without any variation, except that they grow daily more importunate and clamorous, and raise their voices in time from mournful murmurs to raging vociferations. This eternal monotony is always detestable to a man whose chief pleasure is to enlarge his knowledge, and vary his ideas. Others talk of freedom from noise, and abstraction from common business or amusements; and some, yet more visionary, tell us, that the faculties are enlarged by open prospects, and that the fancy is at more liberty, when the eye ranges without confinement. These conveniences may perhaps all be found in a well-chosen garret; but surely they cannot be supposed sufficiently important to have operated unvariably upon different climates, distant ages, and separate nations. Of an universal practice, there must still be presumed an universal cause, which, however recondite and abstruse, may be perhaps reserved to make me illustrious by its discovery, and you by its promulgation. It is universally known that the faculties of the mind are invigorated or weakened by the state of the body, and that the body is in a great measure regulated by the various compressions of the ambient element. The effects of the air in the production or cure of corporeal maladies have been acknowledged from the time of Hippocrates; but no man has yet sufficiently considered how far it may influence the operations of the genius, though every day affords instances of local understanding, of wits and reasoners, whose faculties are adapted to some single spot, and who, when they are removed to any other place, sink at once into silence and stupidity. I have discovered, by a long series of observations, that invention and elocution suffer great impediments from dense and impure vapours, and that the tenuity of a defecated air at a proper distance from the surface of the earth, accelerates the fancy, and sets at liberty those intellectual powers which were before shackled by too strong attraction, and unable to expand themselves under the pressure of a gross atmosphere. I have found dulness to quicken into sentiment in a thin ether, as water, though not very hot, boils in a receiver partly exhausted; and heads, in appearance empty, have teemed with notions upon rising ground, as the flaccid sides of a football would have swelled out into stiffness and extension.