If you have occasion to visit an artist's studio, by no means meddle with anything in the room. Reverse no picture which stands or hangs with face to the wall; open no portfolio without permission, and do not alter by a single touch any lay-figure or its drapery, piece of furniture or article of _vertu_ posed as a model. You do not know with what care the artist may have arranged these things, nor what trouble the disarrangement may cost him. Use no strong expression either of delight or disapprobation at anything presented for your inspection. If a picture or a statue please you, show your approval and appreciation by close attention, and a few quiet, well chosen words, rather than by extravagant praise. Do not ask the artist his prices unless you really intend to become a purchaser; and in this case it is best to attentively observe his works, make your choice, and trust the negotiation to a third person or to a written correspondence with the artist after the visit is concluded. You may express your desire for the work and obtain the refusal of it from the artist. If you desire to conclude the bargain at once you may ask his price, and if he names a higher one than you wish to give, you may say as much and mention the sum you are willing to pay, when it will be optional with the artist to maintain his first price or accept your offer. It is not proper to visit the studio of an artist except by special invitation or permission, and at an appointed time, for you cannot estimate how much you may disturb him at his work. The hours of daylight are all golden to him; and steadiness of hand in manipulating a pencil is sometimes only acquired each day after hours of practice, and may be instantly lost on the irruption and consequent interruption of visitors. Never take a young child to a studio, for it may do much mischief in spite of the most careful watching. At any rate, the juvenile visitor will try the artist's temper and nerves by keeping him in a constant state of apprehension. If you have engaged to sit for your portrait never keep the artist waiting one moment beyond the appointed time. If you do so you should in justice pay for the time you make him lose. A visitor should never stand behind an artist and watch him at his work; for if he be a man of nervous temperament it will be likely to disturb him greatly. GENTLEMEN PASSING BEFORE LADIES. Gentleman having occasion to pass before ladies who are already seated in lecture and concert rooms, theaters and other public places, should beg pardon for disturbing them; passing with their faces and never with their backs toward them. WHERE GENTLEMEN MAY KEEP THEIR HATS ON.