Page:Plates illustrating the natural and morbid changes of the human eye.djvu/18

12 The fibres anastomose freely with each other and form a close network; the lacunas between the fibres were occupied by fluid; no granules were perceptible.

(3.) Clot of blood in the choroid.

(4.) Elastic lamina of the choroid.

Figs. 4, 5. Peculiar-shaped, narrow, square, and vertically notched, upper central permanent incisor teeth, from persons suffering from inherited syphilis.

PLATE IV. Fig. 1.

"The cataract knife." (The blade of the knife should gradually increase in thickness from the point to the heel, and should, while passing, e. g. through the aqueous chamber, not allow any aqueous humour to escape.)

Fig. 2. "The lent lancet-shaped knife." This knife should increase in thickness from point to heel, like the cataract knife. The cutting edges, from the bend to the sjt)t where they commence to converge towards the point, should be parallel with each other. An incision made with this part of the knife is equally wide throughout.

Of the lancet-shaped knife different sizes are in use. Fig. 2 represents the middle size of the bent one. The largest size is used for extraction of cataract, the smaller sizes for artificial pupil, iridectomy, &c.

To the left of Eig. 2 is shown a side view of the bent lancet-shaped knife.

Fig. 3.

"The hroad needle." The edges of the needle are sharp from the point to within half an inch from the heel.

Fig. 4.

"The cataract needle" The needle should be so constructed as to pass