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EXPLANATION OF PLATE I.

Fig. 1.-The appearance of the brain on which an abscess had formed. The case is described at page 91.

a. Shews the external aspect of the brain, with the situation of the abscess. b.-A section of this organ; the purulent matter having insinuated itself between the convolutions of the brain, and caused their displacement with absorption of a portion of the cerebral substance.

Fig. 2.-Structure of the echino-coccus; the parasite of the acephalo-cyst, described by Mr. Erasmus Wilson. See page 98.

a.-A cluster of echino-cocci contained in their proper membrane, the membrane being connected by means of a peduncle to the internal membrane of the acephalo-cyst.

b. A group of echino-cocci set at liberty by the rupture of their proper membrane, and of the peduncles by which they are connected to that membrane. Both the preceding figures are magnified 38 times.

c. An echino-coccus in its contracted state, magnified 155 times. The figure is viewed by transmitted light, so that the internal organization of the animal is apparent. At the upper end of the figure is the aperture left by the withdrawal of the head; the line leading downwards from this aperture indicates the course taken by the head during its retraction. The oval-shaped body near the bottom of the figure is the head surmounted by its hooklets. Above the head two of the suctorial processes are seen; and at its lower end the remains of the peduncle.

d. The echino-coccus in its elongated state. The head is surmounted by a circle of hooklets; below the head three suctorial processes are seen, and then follows the body or caudal portion of the animal. Near the lower part of the figure is seen the attachment of the retractor muscle of the head. This figure is magnified 155 times. e. The circle of hooklets viewed upon its under surface; the circle is composed of thirty-four hooks, seventeen long and seventeen short. This figure is magnified 456 times.

f.f.-Separate hooklets magnified 456 times. Each hooklet has a pointed extremity, a blunt extremity, and a base, the latter being equal to about half the length of the entire hooklet.

Fig. 3.-Structure of the cerebellum described at page 94. A portion being subjected to examination by Mr. Erasmus Wilson, presented the appearances shewn in the following figures:

In

a.-A part of the section of the tumour magnified thirty-eight times. this examination the tumour had the appearance of being composed of small polygonal masses loosely connected together; some of them being hollow in their interior, or filled with a softer substance than that which forms the exterior.

b.-A portion of the same tumour, seen with the same magnifying power, but dried. In this state the section has a loose, spongy, or foamlike appearance.

c.-A portion of the tumour magnified 310 times, shewing its minute structure. With this magnifying power, it is seen to be composed of cells varying in size from too of an inch in diameter, containing in their interior more or less granular matter and one or more nuclei.

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d.-Separate cells magnified to the same amount as in the preceding figure. e.-A small elongated body, of which there were several interspersed among the cells, apparently a portion of a nerve tubercle.

VOL. I.]

THE

VETERINARY RECORD, &c.

APRIL 1845.

[No. 2.

AN ACCOUNT OF A SUPPOSED OSSIFIED BRAIN OF AN OX IN THE VETERINARY MUSEUM

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