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purulent matter. The tendon of the tensor tympani muscle is very soft, and disconnected from the malleus.

The following is a tabular view of the state of the mucous membrane of the tympanic cavity, in the 120 dissections related in the present and former papers.

A. In the First Stage of Inflammation. 1 With simple inflammation of the mucous membrane; its vessels being enlarged, tortuous, and distended with blood (44, 52, 53, 64, 80, 81, 83, 113, 114, 118) 2 Ditto with an accumulation of mucus (54) 3 Membrane inflamed, with effusion of blood into its substance (89, 101, 102) 4 Membrane inflamed, with effusion of serum tinged with blood into the tympanic cavity (109)

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5 Membrane inflamed, with lymph effused into the tympanic cavity (78, 79).

6 Membrane inflamed, with blood and lymph effused into the tympanic cavity (76, 77) 7 Membrane inflamed, with effusion of pus into the tympanic cavity (117)

B. In the Second Stage of Inflammation.

1 With simple thickening of the lining membrane of the tympanic cavity (29, 62, 93, 94, 99)

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2 The membrane thick and pulpy (45, 46)
3 The membrane thick and flocculent (13)
4 Ditto, and the cavity full of bands of adhe-

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sion (48) 5 Membranous bands connecting the membrana tympani to the inner wall of the tympanum (89, 101, 102, 110, 112) 6 Membranous bands connecting the membrana tympani to the promontory and the chorda tympani to the stapes (90) 7 Membranous bands connecting the membrana tympani to the incus (116) . 8 Ditto connecting the membrana tympani to the stapes (16, 118)

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9 Ditto connecting the membrana and chorda
tympani nerve to the stapes (91)

10 Ditto connecting the membrana tympani
and malleus to the promontory (119)
11 Ditto connecting the membrana and chorda
tympani to the incus (103, 104)
12 Ditto connecting the membrana tympani
and ossicles to the inner wall of the

tympanum (110).

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13 Ditto connecting the malleus to the inner wall of the tympanum (28, 68)

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14 Ditto connecting the incus to the inner wall of the tympanum (14) .

15 Ditto connecting the stapes with the pro

montory (15, 17, 18, 19, 20, 21, 23, 24,
25, 26, 27, 30, 32, 35, 36, 37, 57, 58,
66, 88, 108, 115, 117, 120)

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16 Anchylosis of the stapes to the fenestra

ovalis (40, 41)

17 Membranous bands forming a network over
the fenestra rotunda (86, 87)

18 A broad membrane passing from the pro-
montory to the mastoid cells (70, 71)
19 The cavity of the tympanum full of bands
of adhesion (49).

20 Membranous bands containing scrofulous

matter (67, 68, 69)

21 The cavity of the tympanum full of calca-
reous concretion (10, 11, 60, 100)

22 Ditto full of caseous concretion (30, 39)
23 With ridges of the bone projecting from
the surface of the promontory (95, 96) .

C. In the Third Stage of Inflammation. 1 With ulceration and thickening of the mucous membrane attended by the formation of pus (33, 34, 107)

2 With ulceration of the membrane and loss of one or more of the ossicula (47, 72,

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It thus appears that of the 120 dissections there

were:

20 Ears in the first stage of inflammation of the

tympanic cavity.

65 Ditto in the second stage. 6 Ditto in the third stage. 29 Ditto in a healthy state.

I have much pleasure in expressing my thanks to the numerous friends, who have so materially assisted me, in obtaining the specimens necessary to the pursuit of this subject. I shall always be happy to show the preparations which form the groundwork of this paper to any members of the profession, to whom I again take the opportunity of stating, I shall feel much indebted for every opportunity they can afford me of dissecting the organ of hearing, especially when it is diseased.

12, Argyll Place, St. James's, May 1843.

ON THE

EFFECTS OF

RICKETS

UPON THE GROWTH OF THE SKULL.

BY ALEXANDER SHAW, Esq.,

SURGEON TO THE MIDDLESEX HOSPITAL.

READ JUNE 27TH, 1843.

SOME years ago the Society did me the honour to publish in their Transactions, a paper on certain peculiarities in the conformation of the skeleton produced by rickets.* In that paper, my principal object was to show that, independently of the softening and consequent incurvation of the bones to which rickets has been long known to give rise, it has the effect of arresting the growth; and, as between infancy and adolescence, a remarkable change takes place in the relative proportions of the figure,

* Vol. xvii. The same subject was further pursued in two papers communicated by the author to the London Medical Gazette, March 1835, and Nov. 1835.

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