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The well-dried object mounted fastened the bottom the cell a little the same cement which the cell made, and allowed harden place, always protecting the cells against dust in all stages preparation. Finally paint a thin circle the same cement the upper edge the curtain where to buy essays ring and place a clean, dry cover glass five-eighths inch in diameter the ring. When fast, the outside the cell painted wltti the same cement that overlays the glass cover, aud if this work was all done the self-centering turn-table, ornamental colored rings may put as a.
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If the zinc-white cement becomes too thick flow readily, thin adding a little benzole. Use the bru well filled with cement when putting In the bottom the cell, that when the cement dries It will perfectly smooth like fine white porcelain.
Instead making dark cells with Brunswick black, the bottom a zinc white cell may painted black with ivory black, such as put in collapsible tubes for artist's use.
Such cells are harder and there no danger the cement softening in warm weather and allowing the objects sink into as sometimes occurs We come now the consideration balsam mounts research paper help but as this method mba essay editing service used mainly for sections drugs will first consider the making the sections.
The flrct requisite that the section cut thin enough if possible, not more than one cell thickness the substance examined or from Vaoo an inch thick.
Practically, cut as thin as possible without tearing the sections.
The knife should very sharp and should carried across the drug with one steady sweep and not cutting backward and forward. Some drugs can cut without preparation, but phd dissertation Writing essay websites writing services the majority drugs require previous softening In water over need help with dissertation night, or if very resinous tbey may soaked in alcohol remove the resin and then in water soften them. Woods and woody roots, rhizomes, hard barks, etc.
may sometimes require boiling in water make them soft and flexible enough give good sections.
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If the sections are cut without a microtome or section cotter, the substance held in the left hand and the sections are cut drawing the knife towards oneself, much in the manner in which lead pencils are sharpened. A little practice will enable one good work, although, course, the serviceable portions the sections may smaller than when cut aid a section If the student works witn a section cutter in which an extra tube moves tip and down in a well-tube, the object wedged in this tube with cork or elder pith, or if hard like wood, simply forcing a piece into the tube that the end projects about one-third or onefourth an inch.
This tube, with the object cut into sections, then placed in the section-cutter and gradually raised means the screw until the knife carried over the top plate the apparatus best resume writing services in atlanta ga cuts off a portion the object and leaves It with a smooth surface. While cutting, the surface the object and the knife should kept thoroughly wet prevent tearing the sections. By means the screw the object Is raised a trifle and a section cut off with one steady sweep the knife if tears, try a litte thicker section, until the proper thickness has been ascertained, when the balance the sections are cat that thickness. Of coarse the knife must sharp and without notches its catting edge, and the proper thickness section for each object the thinnest that can cut without tearing. When cut, the section carefully floated off into a watch-glass or small porcelain saucer means a small quill camel-hair pencil. Section after section may cut until the object no longer projects above the inner tube, and If ire were at all careful ought have thirty or forty sections from the one-third an inch object Another method catting sections which better adapted soft or small objects, imbed them in paraffin make a paper tobe the thickness the inner tube the section cutter, fit a cork in the end this tnbe and then fix the object cat which mast first properly softened soaking in water, if necessary the cork in such a manner that will stand upright in the tube when the cork inserted in one end then pour in melted paraffin, which, when cools, will form a plug paraffin in which the object imbedded. This plug then fastened in the section-cutter and sections academic essay writing help are cut from in the same manner as just described. These sections are then placed In benzin dissolve the paraffin, the sections are then removed alcohol and from that they may transferred custom essay paper such other mounting We examine these sections with a lens, choose one the thinnest and most perfect ones and mount permanently in glycerin or glycerin jelly, as will explained presently, that may study the cell-contents, starch, The sections many drugs, however, are unsatisfactory when examined and mounted In this way and must first clear them the simplest way being place a section in a watch-glass with distilled water and then wash gently stippling with a camel hair pencil, that much, If not most, the cell contents may washed out. If this simple washing sufficiently clears them, mount such a section, but usually must clear them with chemical solutions remove all the cell contents, which, the way, are little or no Importance in the examination most the drugs. Add a drachm or two distilled water, six eight drops liquor potass and one half fluldrachm labarraque solution, and place a few the sections into this mixture.