On a Sunday evening, three weeks ago, it is alleged that a most hideous and devilish crime was committed by a member of the police force of this city, which has been rigidly suppressed by the authorities for reasons best known to themselves. The outrage which would have been monstrous enough as the perpetration of a civilian; gains an additional element of atrocity as the deed of a sworn defender of the law.

On a Sunday evening two weeks ago, a young Irish girl, Mary Maguire by name, was returning from the neighborhood of Prospect Park. It was nearly 10 o'clock and she was on Third avenue, walking at the top of her speed because belated.

As she was hurrying along a strange man approached her and offered to see her home. She was much alarmed by the bold proposition and quickened her pace. The stranger kept up with her and renewed HIS IMPUDENT OFFER.

Then she ran as fast as she could to Atlantic avenue. Outstripping her pursuer, she did not stop till, all breathless as she was, she met a policeman on duty, in full uniform. She went up to him at once and begged him to protect her from the insolent fellow who had put her to flight.

The policeman stared at her for a moment and then, without offering to look for the man of whom she had complained, asked her what she was doing out so late.

She told him, and explaining that she was engaged as a domestic by Mrs. Lyons, of Putnam avenue, near Irving place, asked him the shortest way home.

He stared at her again and then assured her that it was not safe for her to go home alone, that the neighborhood swarmed with desperate ruffians, and that if she would wait until the roundsman had passed (which would be in ten minutes), that he would escort her to her residence.

The hapless girl gratefully accepted his offer, and when THE ROUNDSMAN HAD PASSED, the two set off, as she supposed toward the address which she had given the uniformed scoundrel.

They walked down Atlantic avenue until they reached the Tivoli Garden, which resort the officer entered alone. Finding the proprietor, he instructed him to open the back gate of the premises, which was done.

Then returning to the bewildered girl the officer conveyed her into the garden, closed the gate and desired her to comply with his wishes. She screamed and he struck her on the face with his clenched fist; knocking her almost senseless tot he ground.

Battered and bleeding she resisted with her feeble force, the villain repeatedly striking her and endeavoring to reduce her to insensibility. AT length, he stunned her, and inflicted upon her an outrage of which the barbarous details are beyond description.

It is sufficient to say that the poor creature suffered not only the WORST INDIGNITY that can be heaped upon her sex, but as well physical injuries so cruel and so horrible that it scarcely possible she can survive them.

Having accomplished his design, the fiend disappeared and she was left on the ground, bewildered, lacerated, and heart broken. Having managed to drag herself into the street, she encountered another officer, who having heard her awful story, conveyed her to the Tenth Precinct Station House. Captain Campbell was informed of the heinous crime and he mustered all the men who had come off post at midnight.

The unfortunate girl was then confronted by the platoon, and at once indicated Officer G.W. Burns as the brute who had violated her.

A moment's inquiry proved that Burns had been on the post in question, and that he had been seen, as she described, by the roundsman.

Captain Campbell at once STRIPPED THE BUTTONS off him, and he was p laced in a cell.

Next day a private investigation into the matter was held before Justice Morse, which had to be adjourned in consequence of the woman's horrible injuries. At the next examination the case had to be carried into the Justice's private room, where she gave her evidence in a manner which impressed and shocked all who heard it.

Doctors Baldwin and Gleavy testified to the appalling character of the wounds which she had sustained, and also to her personal purity before the brutal act had been committed.

Mr. Stephen Ostrander, who appeared for Burns, attempted to prove, by cross examination, that the complaint, was "a put up job," and that the girl was a consenting party to her own disgrace and suffering, but his attempt signally failed.

The case was adjourned again until yesterday, when medical evidence was produced, showing that Mary Maguire was too ill to appear, and there was every prospect of A FATAL TERMINATION TO HER AGONY, upon which another adjournment was had, Mr. James W. Ridgway, Jr., appearing for the prosecution.

The prisoner is a dark, thick set fellow, with black curly hair and a black mustache. He is married, has a small family, and was appointed on the police force about six weeks ago.

The victim is a slender and very delicate girl of 28,with an exceedingly pretty face and an exceptionally fragile physique. She was born in Ireland, and has been four years in this country. Her character is represented to be most excellent, and her manners, even in her present condition of suffering and distress, are most prepossessing.

The mystery which has attached to the case is due to the careful labor taken by the Police Commissioners to keep it from the public.

What General Jourdan Says:

A reporter of the Eagle called upon General Jourdan this morning, to obtain from him some further particulars of the outrage. The General admitted the facts as above stated, and added that the day after Burns' identification the prisoner was arraigned for trial before the Board of Police. An examination was had into the charges, and evidence was taken against him. He declined, on his own part, to testify, alleging that he had no lawyer, and that anything he might say would prejudice the Police Court investigation against him. The Board accordingly suspended him until the matter should be disposed of in the Criminal Courts.

Inspector Waddy, on being questioned stated that Burns was thirty years of age, a native of Ireland, by occupation a porter, and a married man of family. He was appointed on the 19th of September, 1873. Neither General Jourdan nor Inspector Waddy undertook to give any reason for keeping intelligence of the crime from the public. They appeared to look upon it as a purely professional affair, in which none but professional [policemen could possibly have any interest.

Mr. Moore, Assistant District Attorney, says that he will prosecute Burns to the utmost and if he can be convicted will demand the full penalty of the law. Should the woman die, Burns will have to stand trial for manslaughter.