The Ladies' Book of Etiquette, and Manual of Politeness

Make no remark upon the temperature of the room, or its arrangement, when you enter it. Never open or shut a window or door without asking permission, and unless really suffering from excessive heat or cold, refrain from asking leave to take this liberty. If you are invited to go up stairs to your friend's private apartment, you will, of course, accept the invitation, but never go up stairs uninvited. When you reach her door, if the servant has not preceded and announced you, knock, and await her invitation to enter. Then, once in, take no notice of the room, but go instantly to your friend. If she is sewing, do not speak of the nature of her work, but request her to continue, as if you were not present. In cases of long standing friendship, you will not, of course, stand upon the ceremony of waiting for each and every one of your calls to be returned before paying another, but be careful that you are not too lavish of your visits. The most cordial welcome may be worn threadbare, if it is called into use too often. If you are visiting an invalid, or one confined by physical infirmity to one apartment, while you are cheerful and ready to impart all the news that will interest them, do not, by too glowing descriptions of out-door pleasures, make them feel more keenly their own deprivations. It is well, when making such calls, to converse upon literature, or such general subjects as will not remind them of their misfortune.