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After the specimen has been examined It may washed off in water, or in a little alcohol if necessary, and the glasses rubbed dry with a bit tissue paper. Bnt if wish preserve the specimen for future study, a permanent mount must made. The same kind glass slides, three one Inches, Is used, but It would well have an assortment essay revision service sizes cover glasses, some onehalf, five-eighths and three-fourth inches in diameter.

A few dozen small brass curtain rings, five-eighths inch outside diameter, should also obtained. The appliances required for making permanent mounts are few and Inexpensive the student should procure a few camel hair pencils a few watchglasses or one-half ounce or one ounce white porcelain ointment jars essay writers online with covers a delicate pair scissors one or two small knives similar the smallest knives In a student's dissecting case a few needles, the eye ends which have been poshed Into the ends small wooden handles, for which cheap pen-holders will answer very well. A few spring clips for holding the cover glasses may bought from the optician.

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A few one-ounce vials are provided with perforated corks in which ordinary pipette medicine droppers are inserted that the end the pipette will reach nearly the bottom the vUl.

A few small bell glasses cover slides which are In process preparation and protect them from dust may also used, bat placing such slides in the bottom empty cigar boxes and closing the lid Is just as good.

In the vials with pipettes pot in one glycerin in another creosote water In a third a mixta glycerin and water and add a few ordinary vials, one containing alcohol, one absolute alcohol and one oil cloves. Evaporate a few ounces clear, clean Canada balsam until thick and nearly solid cooling. Poor one-half ounce this thick balsam, while warm, into a vial and add one-half Hold oonce chloroform leave the balance the balsam in Its thick condition.

Set all these vials in a closet or deep cigar box where they are protected from dost.

Boy a small vial each, Brunswick black, zinc white, and If economy does not forbid, a section-cotter and a selfcentering torn-table may added, bot the latter are not necessary for serviceable work, bot they add moch the mechanical perfection the finished slides. There are practically three methods mounting slides dry in a solid medium or in fluids. We will first consider dry mounts. Of many drugs need simply examine the surfaces, for instance, when comparing digitalis leaves with mullein leaves which are said occasionally added or substituted for the first or in examining seeds and fruits like anise, etc.

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First Prepare the slide pasting in the center a disc black needle paper, or white paper, made punching with a punch such as used for making gun-wads then punch similar discs from different thickness paper, cardboard and thin paste-board.

In these discs punch holes onehalf inch in diameter with a smaller punch, that when completed have rings different thicknesses. When want custom academic writing services make a dry mount paste one these rings the paper disc the slide, choosing black or white as looks best for a particular object, that have a cell with a white or black bottom, and a depth which slightly greater than write my college essay the thickness the object mounted. A bit the leaf, preferably cut with a cork borer a piece dissertation help reviews leather into buy thesis uk a disc a little less than one-half inch in ameter, then fastened the bottom the cell means a little shellac need help in thesis varnish or tragacanth paste and pressed flat gently pressing into place with a cork having about the same diameter as the object. Clean a cover glass three fourths Inch in diameter gently rubbing between two pieces moist filtering piper between the thumb and index finder, then in the same manner with a soft, wellworn silk handkerchief and after rendering the upper side the paper ring adhesive with shellac varnish or tragacanth paste term paper services put the cover glas. Finally punch a hole one-half inch in diameter from a strip colored glazed paper and paste over the upper surface the slide that the opening in the strip corresponds the cell in which the preparation mounted the edges the paper must then cut with scissors along the edges the slide and when dry a label may pasted one end the slide which the name Seeds and other dry opaque objects may mounted in the same way, care being taken that the cover glass as near as possible the upper surface the object wiihout actually touching and that the prepared cell and the object itself thoroughly dry before the cover glass put Second Paint a circle five-eighths inch in diameter the slide with Brunswick black or with zinc-white, according whether the object looks best a dark or white background. Place one the curtain rings this painted circle and allow It dry. The bottom and sides the cell thus formed must then painted with the same cement and allowed harden. Cells this kind should prepared some days or even weeks in advance, that they are thoroughly seasoned when wanted for use.

 

 

 

 

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