. The Pharmaceutical era. ith the finger tips againstan emery wheel, or rubbed on a fine grained file, untilone side is tolerably smooth, the finish being given byrubbing on a fine hone, and lastly on a leather strop orsimilar piece of leather. A large drop of balsam is then placed on the middle ofa piece of glass of convenient size for holding, and heat-ed until volatile portions are driven off and the balsamhardens on cooling. Warming the balsam again until itsoftens, the specimen is pressed upon it, with the smoothside next the glass, and allowed to cool. The object ofthe glass is to preven
. The Pharmaceutical era. ith the finger tips againstan emery wheel, or rubbed on a fine grained file, untilone side is tolerably smooth, the finish being given byrubbing on a fine hone, and lastly on a leather strop orsimilar piece of leather. A large drop of balsam is then placed on the middle ofa piece of glass of convenient size for holding, and heat-ed until volatile portions are driven off and the balsamhardens on cooling. Warming the balsam again until itsoftens, the specimen is pressed upon it, with the smoothside next the glass, and allowed to cool. The object ofthe glass is to prevent the section from breaking whenthe required thinness is reached, and to serve as a han-dle by means of which it can be held while the other sideis being ground and polished like the first. When suffi-ciently thin to be transparent, the glass is stood on itsedge in a vessel of benzol until the balsam is dissolved,and the section drops off by its weight. Any attemptto force it loose from the glass will almost certainly re-. Queen & Self-Centeriiig Turn Table suit in breaking. It may be washed in strong alcohol,using a camels-hair brush, and set aside until the sur-face dries off. While the section is drying, a drop of balsam is placedon the center of a slip and heated until it will harden atonce on cooling. Another drop is placed on a cover-glassand treated similarly. The section is now placed in thecenter of the balsam, covered with the cover-glass, andthe slip heated until the balsam softens. The object of the preliminary heating of the balsam isto drive off the liquid portions which would otherwisegradually penetrate the section, and render it so trans-parent as to render its structure indistinguishable. Finishing Slides.—The glass slip containing a specimensuitably mounted, and covered with a cover-glass istechnically known as a slide. The finishing consists inthe addition of a label to one or both ends of the slip,upon which the name of the specimen and other dataare
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
