In a weekly paper entitled the "Civil Service Gazette" I was subjected, from an early period of my career at the Post Office, to almost constant personal attacks; many of them written with considerable plausibility, but all void of substantial truth. Every one who has well considered the subject of slander must know how great an advantage the unscrupulous journalist has over the object of his attack, in the dilemma in which he places him of either replying, at much expense of time and dignity, to unfounded charges, or of allowing to them the sanction which a very large, though somewhat thoughtless, portion of the public infers from reticence. The amount of mischief that may be done in any department of manufacturing industry by artful misrepresentation addressed to over-willing ears has been painfully illustrated of late; and this is by no means without its parallel in that widely-extended department of Government which was so long the scene of my labours. Some notion of the means employed may be formed by a perusal of the following hand-bill, a copy of which was most properly forwarded to the Chief Office by the postmaster of a large provincial town, who found it in circulation among the clerks of his office:-- POST OFFICE REFORM. =AGITATE--AGITATE--AGITATE!!!= READ THE "CIVIL SERVICE GAZETTE," Unstamped 5d.--Stamped 6d. =July 24th, 1858,= Rowland Hill's Last Ukase! BREAK DOWN OF THE GAGGING SYSTEM! WHITE SLAVES OF THE POST OFFICE. 31st, Rowland Hill's Job Frustrated: HIS GREAT REVENGE: The Screw and Gagging System of the General Post Office. =POST OFFICE REFORMS= AND THE WAY TO GET THEM: HOPE FOR THE LETTER CARRIERS. Coming Emancipation of the White Niggers. August 7th, POST OFFICE MANAGEMENT. OUR MISSING LETTERS AND OUR LATE DELIVERIES. The Letter Carriers' "Bill of Fare." 14th, Post Office Reform by Merit, REVELATIONS FROM ST. MARTINS LE GRAND. =HOPE FOR THE OPPRESSED.= THE POST MASTER GENERAL AND THE LONDON LETTER CARRIERS. Communications addressed, =pre paid=, to C. W. No. 9, East Mount Terrace, LONDON.--E. will meet with immediate attention.