There are obtainable more elaborate microphotographic apparatus than the one figured and described, but for most workers this one will prove highly satisfactory. It is possible, by inclining the tube of the microscope, to make good microphotographs with an ordinary plate camera. This is accomplished by removing the lens of the camera and attaching the bellows to the ocular, focusing, and photographing. CHAPTER IV HOW TO USE THE MICROSCOPE In beginning work with the compound microscope, place the base of the microscope opposite your right shoulder, if you are right-handed; or opposite your left shoulder, if you are left-handed. Incline the body so that the ocular is on a level with your eye, if necessary; but if not, work with the body of the microscope in an erect position. In viewing the specimen, keep both eyes open. Use one eye for observation and the other for sketching. In this way it will not be necessary to remove the observation eye from the ocular unless it be to complete the details of a sketch. =Learn to use both eyes.= Most workers, however, accustom themselves to using one eye; when they are sketching, they use both eyes, although it is not necessary to do so. =Open the iris diaphragm=, and incline the mirror so that white light is reflected on the Abbé condenser. Place the slide on the centre of the stage, and if the slide contains a section of a plant, move the slide so as to place this specimen over the centre of the Abbé condenser. Then lower the body by means of the coarse adjustment until the low-power object, which should always be in position when work is begun, is within one-fourth of an inch of the stage. Then raise the body by means of the coarse adjustment until the object, or objects, in case a powder is being examined, is seen. Open and close the iris diaphragm, finally adjusting the opening so that the best possible illumination is obtained for bringing out clearly the structure of the object or objects viewed. Then regulate the focus by moving the body up or down by turning the fine adjustment. When studying cross-sections or large particles of powders, it is sometimes desirable to make low-power sketches of the specimen. In most cases, however, only sufficient time should be spent in studying the specimen to give an idea of the size, structure, and general arrangement or plan or structure if a section of a plant, or, if a powder, to note its striking characters. All the finer details of structure are best brought out with the high-power objective in position.