By Heber Wilkinson Youngken
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THE MICROSCOPE A microscope is an optical instrument, consisting of a lens, or combination of lenses, for making an enlarged image of an object which is too minute to be viewed by the naked eye. Microscopes are of two kinds, viz. : simple and compound. THE SIMPLE MICROSCOPE This consists simply of a convex lens or several combined into a system and appropriately mounted. A good example of a simple microscope is a reading glass. This type of simple microscope is valuable in field work, in the examination of dried herbarium material or the external characters of crude drugs, where only a low magnification of the object is required.
If an air space be present between the objective and the object, the lens is called a dry one; if a liquid is present between the objective and the If this liquid be oil, object, the lens is called an immersion lens. FUNDAMENTAL CONSIDERATIONS II FIG. 4. Diagram illustrating optics of a compound microscope in use. Fi, focal plane of objective; F2, Lower focal plane of eyepiece; A, Optical tube = distance between Fi and Fa; Oi, object; Oz, real image in F2, translength posed by the collective lens, to O 3 real image in eyepiece diaphragm; O-t, virtual image formed at the projection distance C, 250 mm.
Materials are placed in this acid (which should be kept in a bottle coated internally with a thick layer of paraffine) for from 3 days to a week, depending on the of the acid. water for The 2 to 5 acid hours. of all mineral deposits with one or two changes then washed out thoroughly with running This treatment completely frees the tissues size of the objects, is without affecting the organic structure. SCHULZE'S MACERATION PROCESS This method is employed longitudinal sections, that for the separation of cells.