Microscopical morphology of the animal body in health and disease / by C. Heitzmann. With 380 original engravings.
- Carl Heitzmann
- Date:
- 1883
Licence: Public Domain Mark
Credit: Microscopical morphology of the animal body in health and disease / by C. Heitzmann. With 380 original engravings. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![the size and sluipc of the s|)c<'iiii('ii, is iiukIc ; we fill the l)(»ttom ■with !i iiu'ltcd niixtiu't' of pai'amiMc and wax, six or fi^ht parts of the former t(» owe of the latter, with the addition, perhaps, of a. little nintton-tallow. As soon as the layer of the niixtnre in the box heeomes cloudy, tlie s])eeiinen, from which the surplus of alcohol meanwjiile was allowed to evaptn-ate, is ti'ansferred into the hox, and the j)araffine mixture, not too hot, is poured over it. The hox, when full, is j)laee(l in cold water, where the surronntlino- paper is destroyed, and the fat becomes hard in a short time. The sections are made simultaneously throug'h the paraffiue aud the specimen, in the same way as described before. No clearin<>' re-at»'euts, such as turpentine or oil of cloves, should be used ])efore imbedding- the specimen, as such re-agents render the details of the structure indistinct. 'Small specimens may be fitted into two pieiies of the best so-(!alled velvet-cork, properly hollowed out, and cut together with the cork. Everybody can learn to cut sections by more or less practice, though a certain amount of cleverness and steadiness of the hands is i-equired to reach perfection. The rule is, that the section should be very thin, transparent, while its size is of much less importance. Valuable specimens, of which very little ought to be lost, may be cut with a section-cutter. The simplest style is a metal tube mounted at right angles with a circidar black- glass or India-rubber plate. The centi'al perforation of the plate opens into a cylindiical metal box of varying diameter, which, by means of a screw, slides within the metal tube. The paraifine mixture is poured into the metal box, and the imbedded speci- men is gradually lifted to the level of the plate, over w^hich the flat surface of the razor-blade is passed. Complicated cutting- machines, in which the blade of the knife works on the principle of a plane, are invented in large number, and prove to be satisfactory in the hands of their inventors, or whenever a large number of specimens is required for distribution or for trade. The greater the complication, the less is the value of such machines. Mounthu). The sections, after being stained, are transferred on a metal spoon with the assistance of a needle. The best spoon for the purpose is one made of hammered copper wii'e, the flattened and rounded extremity of which is at a right angle to the wire, the latter constituting the handle. Perforations of the spoon are superfluous. The sm*plus water is soaked away from the lower surface of the spoon l)y means of good white](https://iiif.wellcomecollection.org/image/b21219163_0033.jp2/full/800%2C/0/default.jpg)
