The microscope; an introduction to microscopic methods and to histology . the middle of a slide, using the centering card, andmount in glycerin jelly as directed in § 252. Air bubbles are not easily removedfrom glycerin jelly preparations, so care should be taken to avoid them. \ 255. Mounting Objects in Resinous Media.—While the media misciblewith water offer many advantages for mounting animal and vegetable tissues thepreparations so made are liable to deteriorate. In many cases, also, they do notproduce sufficient transparency to enable one to use high enough powers for thedemonstration of
The microscope; an introduction to microscopic methods and to histology . the middle of a slide, using the centering card, andmount in glycerin jelly as directed in § 252. Air bubbles are not easily removedfrom glycerin jelly preparations, so care should be taken to avoid them. \ 255. Mounting Objects in Resinous Media.—While the media misciblewith water offer many advantages for mounting animal and vegetable tissues thepreparations so made are liable to deteriorate. In many cases, also, they do notproduce sufficient transparency to enable one to use high enough powers for thedemonstration of minute details. 172 MOUNTING AND LABELING [CH. VII By using sufficient care almost any tissue may be mounted in a resinousmedium and retain all its details of structure. For the successful mounting of an object in a resinous medium it must insome way be deprived of all water and all liquids not miscible with the resinousmounting medium. There are two methods of bringing this about : (A) By dry-ing or desiccation {\ 256), and (B) by successive displacements (§ 258).. Fig. 142. Small spirit lamp modified into a balsambottle, a glycerin or glycerin-jelly bottle, or a bottlefor homogeneous immersion liquid. For all of thesepurposes it should contain a glass rod as shown in thefigure. By adding a small brush, it answers well fora shellac bottle also {See Fig. 170). \ 256. Order of Procedure in Mounting Objects in Resinous Media byDesiccation : 1. The object suitable for the purpose (flys wings, etc.) is thoroughly driedin dry air or by gentle heat. 2. The object is arranged as desired in the center of a clean slide on thecentering card (Fig. 138). 3. A drop of the mounting medium is put directly upon the object or spreadon a cover-glass. 4. The cover-glass is put on the specimen with fine forceps (Fig. 136), but inno case does one breathe on the cover as when media-miscible with water areused. 5. The cover-glass is pressed down gentl}7. 6. The slide is labeled {\ 308). 7. The pr
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