We are in receipt of a pamphlet entitled "The Graydon Dynamite Projectile High Explosive and Accelerated Cartridge," from which we learn that the experiments made at Sandy Hook, which were described in No. XVI of these Notes, were carried out under the Graydon system. The pamphlet contains three cuts showing the target before and after the experiments and one of the shells which struck "point on." The target, according to the cut, was a section of a monitor turret in service condition, lacking only the support which the completed cylinder gives. We should judge from the appearance of the shell, if the artist has represented it correctly, that the explosive did not undergo complete detonation.