"The coloured figures, exhibited by the phatasmagorists, have no relation to these effects of light: they are effigies covered with gold-beater's skin, or any other transparent substance, in which is placed a dark lantern. The light of this lantern is extinguished or concealed by pulling a string, or touching a spring, at the moment when any one wishes to seize on the figure, which, by this contrivance, seems to disappear. "The proprietors of the grand exhibitions of _phantasmagoria_ join to these simple means a combination of different effects, which they partly derive from the phenomena, presented by the _camera obscura_. Some faint idea of that part of physics, called optics, which NEWTON illuminated, by his genius and experience, are sufficient for conceiving the manner in which these appearances are produced, though they require instruments and particular care to give them proper effect." Such is the elucidation given of the _phantasmagoria_ by an intelligent observer, whose friend favoured me with this communication. LETTER XXXVII. _Paris, December 21, 1801._ If Paris affords a thousand enjoyments to the man of fortune, it may truly be said that, without money, Paris is the most melancholy abode in the world. Privations are then the more painful, because desires and even wants are rendered more poignant by the ostentatious display of every object which might satisfy them. What more cruel for an unfortunate fellow, with an empty purse, than to pass by the kitchen of a _restaurateur_, when, pinched by hunger, he has not the means of procuring himself a dinner? His olfactory nerves being still more readily affected when his stomach is empty, far from affording him a pleasing sensation, then serve only to sharpen the torment which he suffers. It is worse than the punishment of Tantalus, who, dying with thirst, could not drink, though up to his chin in water. Really, my dear friend, I would advise every rich epicure to fix his residence in this city. Without being plagued by the details of housekeeping, or even at the trouble of looking at a bill of fare, he might feast his eye, and his appetite too, on the inviting plumpness of a turkey, stuffed with truffles. A boar's head set before him, with a Seville orange between its tusks, might make him fancy that he was discussing the greatest interests of mankind at the table of an Austrian Prime Minister, or British Secretary of State; while _pâtés_ of _Chartres_ or of _Périgord_ hold out to his discriminating palate all the refinements of French seasoning. These, and an endless variety of other dainties, no less tempting, might he contemplate here, in walking past a _magazin de comestibles_ or provision-warehouse.