It would appear the conspirators were closely watched for some time before they were arrested. Indeed, it was suspected that Government emissaries were employed to foment the conspiracy in order that a terrible example might be made for the benefit of the disaffected. However this may have been, the plot excited the most intense interest among all classes. Thistlewood and the other prisoners were tried at the Old Bailey, April 17th, 1820, and found guilty of high treason. Six were transported for life, the other five, including Thistlewood, were hung on May 1st, and their heads severed from their bodies--the quartering, the usual doom of traitors, having been graciously forgiven. [Illustration: A. Door to the cart-house. B. Door by which the officers entered. C. Stable window. D. Loft-door. STABLE WHERE THE CATO STREET CONSPIRATORS MET. FROM THE 'OBSERVER,' MARCH 5TH, 1820.] The _Observer_ for March 5th, 1820, published some illustrations of the Cato Street Conspiracy. One is an exterior view of the stable in Cato Street where the conspirators met, which is copied on the opposite page. [Illustration: SECTION OF GRENADE PREPARED BY THE CATO STREET CONSPIRATORS. FROM THE 'OBSERVER,' MARCH 5TH, 1820. A. Cylindrical tin Box containing gunpowder. B. Pitched tow. C. Bullets, old nails, Spikes, &c. D. Tin Tube a Fuze filled with damp powder.] There was also an interior view of the hayloft, together with sections of some of the grenades, daggers, &c., large quantities of which were found in the loft. These cuts, which are roughly done, were reprinted in the _Observer_ for March 12th, and two new ones were added, 'Interior view of the Hayloft at the moment when Smithers received his Death Wound,' and a view of the interior of the stable. They are all interesting as examples of illustrated news at a time when the means of producing such things were extremely limited. [Illustration: DAGGER PREPARED BY THE CATO STREET CONSPIRATORS. FROM THE 'OBSERVER,' MARCH 5TH, 1820. A. Dagger made out of a bayonet to use singly or on top of a pike handle. B. Dagger with hole in the middle to receive dagger A. when screwed on, to be used right and left. C. Section of the transverse dagger B.]