A course of instruction in zootomy (vertebrata) / by T. Jeffrey Parker.

  • Thomas Jeffery Parker
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: A course of instruction in zootomy (vertebrata) / by T. Jeffrey Parker. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    skeleton may be either kept in spirit or prepared as follows :— {a) Place for about three days in a solution composed of Glycerine . . . . lo parts. Water .... lo Corrosive sublimate . . o'l „ Alum . . . . 0-2 „ {b) Transfer to melted glycerine jelly made by dissolving 2 parts of gelatine, or gelatine glue, in the above fluid : allow to remain for 2 to 4 days at a temperature just sufficient to keep the jelly fluid. {c) Place in a dry room, until the surface no longer feels damp or sticky; then varnish with a solution of white (bleached) shellac in rectified spirit, II. In the prepared skeleton make out the following points:—■ 1. The notochord (Fig. r, nc), a cylindrical rod, occupy- ing the position of the vertebral column in one of the higher animals ; at its anterior end it tapers to a point some- what suddenly; at its posterior end the tapering is more gradual. It is composed of a strong sheath of cartilage, inclosing a gelatinous central substance (Figs. 4, 6, 7, 8, nc). 2. The neural processes (Fig. i and 6 n.p), small rods of cartilage, set in pairs at short intervals alongthe dorso-lateral regions of the notochord, and pardy inclosing the neural canal (Figs. 4 and 6—8, ii.ca), in which the spinal cord lies. Between the neural processes and completing the shutting-in of the neural canal both dorsally and laterally is a quantity of very tough pigmented fibrous tissue (Figs. 4, and 6—8, f.i).
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