Genre:

Letter, Spoof

Subjects:

Photography, Invention, Crime, Commerce

    Describes his 'modification of the Daguerreotype' that is sensitive to the 'faintest candlelight' and 'a dark lantern'. Claims that it can be used to detect thieves breaking into the 'strong box' of a counting house (which it believes is full of money, despite the 'commercial distress' in the country), and thus supersede the 'services of the Detective Police'.