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Such lenses are low power but will enable the student a great deal really good work and acquire much valuable Information. A Coddington lens, or a so-called linen tester, should obtained.

Still better, because more convenient, a dissecting english essay helper microscope the simplest kind, because this provided with an upright rod for supporting the lens, leaving both hands free for manipulating the specimen or slide mba thesis writers which being examined. For the more thorough examination the mounted specimen a compound microscope may A few dozen slides glasses three one inches executive resume writing service seattle in size, and half an ounce cover glasses about five-eighths inches diameter may purchased from the optician. If wish examine a drug in a harry, with no intention keeping the specimen, require little more apparatus.

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If It Is a powder, as for Instance lupulin, kamala, lycopodium, or any other powdered drug, a little the powder placed a slide and moistened with a drop water or glycerin.

A cover glass then carefully dropped first lowering one edge and then dropping the cover glass that the air driven out but not with enough force drive out the liquid and the specimen.

A little practice will enable one Judge how much liquid take.

Such a preparation requires a rather high power, however, and cannot satisfactorily examined unless one has a compound microscope.

If water or glycerin does not make the object transparent, may have treat as did the tissue paper in our little preliminary experiment use turpentine or oil make the drug more transparent if that will not make clear, take a drop liquor potassa or labarraque solution instead water or glycerin.

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This will dissolve the cell contents and render the cell transparent, but the specimen will soon swell and spoiled. This method will therefore answer only for temporary and Immediate examination. A little soaking in alcohol often use in removing too dense Seeds, surfaces leaves, fruits like anise, fennel, caraway, etc. may examined without any preparation, and with the single lens. Many objects great interest and beauty will found among these drugs. custom note paper Roots, rhizomes, barks, etc. should cut with a sharp knife as present a smooth surface. This surface may examined without farther preparation, but usually more detail can seen putting a drop glycerin the smooth surface, dropping a cover glass and then examining. Some drugs this kind, however, will not show much detail and sections must prepared. The drug soaked in water soften It, and then a thin transverse slice Is cut from with a sharp knife or razor. A little practice will enable the student cut fairly good sections in this way, but for making first-class mounts a mechanical device known as a microtome must used, that the sections may uniform thickness throughout. Sections should cut as Such a ction may then laid in a drop water, glycerin or alcohol a slide and covered with a cover glass. It then ready for examination. If not clear enough may soaked for a few moments In liquor potassa, then gently washed in water with a camel hair pencil, and examined as just suggested. Or the freshly cut section may dropped into alcohol, then changed absolute alcohol, term papers custom then into oil cloves, and then transferred a slide, which a drop oil cloves has been placed, covered with a Watch glasses or the lids small glass or porcelain ointment jars are good receptacles In which any soaking If the slide examined with a microscope care must taken wipe away any surplus liquor that may pressed out from under the cover glass, avoid soiling the instrument.

 

 

 

 

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