'Important to females. Dr. and Mrs.----(20 years' practice) guarantee certain relief to married ladies. Patients from a distance provided with board, nursing, etc. Private advice letter free. Office,----. New York'-- We resolved to visit this establishment that very day. We found it located upon Third Avenue, near----street, over a shop, and situated in the neighborhood of a number of little stores, sandwiched, as it were, between all varieties of trades. A sign on the exterior of the building directed us to pull the bell and walk up stairs. This injunction was probably designed to give the parties notice of the approach of persons desirous to see them, and to put them, and whoever might chance to be with them at the time, on their guard. The correctness of this view was proved by the fact, that, as we entered, we saw a woman peering at us from the floor above, who immediately withdrew on seeing us. We were shown into what had evidently been intended for a hall bed-room but now served the purpose of a reception room or office. Here we were, in a few moments, waited upon, by the very lady or woman who had just peered down upon us, but who, of course, assumed to be totally unconscious of this fact. She was neatly dressed, and of quiet manner; and bowing, awaited our introduction of the object of our visit. We made a poor enough show, doubtless, in our pretended statement of our design in calling, but between us we gave her to understand, as we had previously arranged, that we acted in behalf of a lady friend of ours who had been 'unfortunate,' and who desired nursing, medical attention, and above all, secrecy. Mrs.---- listened to our statement in a matter of fact way, as though our story was 'as familiar as household words,' and then, it must be confessed, kindly enough, with more delicacy and feeling (or show of it) than we would have, _à priori_, given her credit for, explained to us the _modus operandi_ to be pursued. No patients were received at the office in Third Avenue; they were all sent to another branch of the establishment in----street, presided over by a Dr.----. The terms were in all cases strictly the same. Twenty five dollars per week were charged for board and lodging, or one hundred dollars for the month, 'payable invariably in advance.' The fee for nursing and medical attendance was one hundred dollars; while the charge made for receiving and taking care of the child reached the same figure--making in all the considerable sum of three hundred dollars, for which amount it was guaranteed to furnish the most comfortable lodging, the best professional skill, and the most inviolate seclusion--certainly a convenient arrangement on both sides of the transaction.