8. They must be a pleasure to use, not limiting the use of the window or door screened, nor breaking the back or arm when in use. Screen frames are made of metals and of wood. Due to the architectural design of some windows or doors it is necessary for a wood frame to be used, and for the same reason it is often wiser to use a metal frame. Wherever metal frames can be used they are the best to buy, as they will stand up longer, and, if the best be bought, they will need less renovation, as they can be made rigid at only half the width of the wood screen. Furthermore, you get more ventilation than you do with the wood-framed screen. Of course, you want air and as much as you can get of it; therefore the narrower the frame the more perfect the screen. The metals used in frames are pretty much up to the quality of your screens’ maker. They are to be had of bronze and various concoctions of bronze dependent on the patents of your purveyor; of grass finish, copper finish; steel enameled; steel painted; steel grained to look like the wood trim; steel galvanized and steel regalvanized; monel metal. To be honest, there are two better classifications of screens: those that are rustless and those that are not. Monel metal is used for seashore houses, as the salt air does not corrode or corrupt it. Variations of the bronze screen are also adapted to seashore use. The painted steel screen has to be painted over and over again to keep it from rusting and wearing out. The galvanized screen is practically rustless and the re-galvanized is quite positively an insurance against rust. Be sure that when you buy a bronze frame it is not simply a bronze steel frame. Steel invites rust, and the way to have a rustless screen is to make steel an absentee or galvanize it. All the hardware must be of non-rusting metal. No doubt, as soon as the rustless steel is on the market in large quantities, screen men will be using it instead of galvanizing, painting, etc., and using it and bronze and monel metals for hardware. SOME DETAILS The corners in the metal (and in the wood frame as well) have to be of exquisite workmanship. The best types have no screws or rivets or plates or projections of any sort, yet are of a perfect interlocking or welded construction and hold the screen cloth at every point with infallible tenacity. There is no aperture so shaped that it cannot be framed in screens by the ablest screen makers. In the case of the metal screen the bent work is really a work of art, in that they are not puckered or pinched, but are _sans_ humps, _sans_ bumps, _sans_ everything but beauty, rigidity and conformity to conditions.