After the iris with the processes has been removed, pinch up with the tweezers a fold in the choroid. Make an incision with the fine-pointed scissors, and begin removing the choroid to within about 5 mm. of the cut end of the sclerotic. (Fig. 63.) Care must be taken not to penetrate the underlying retina while making this part of the dissection. [Illustration: Fig. 63--Cutting away the choroid.] After part of the choroid has been removed, the specimen will show the three coats of the eye in layer-like arrangement, the hyaloid and lens. The lens may now be cut away, if the specimen is preferred without it. Removing the lens before this time is unwise, because it acts as a protection to the other tissues while the specimen is being handled during the dissection. This specimen will show to the best advantage if it is suspended in a jar containing a 5 per cent. solution of formaldehyde. Figure 64 shows the specimen. [Illustration: Fig. 64--A. Optic nerve. B. Sclerotic. C. Choroid. D. Retina. E. Hyaloid. F. Lens.] INDEX A Accessories, ocular, 95 Alcohol as a preservative, 34 Alcohols, method of running through, 58, 59 Anterior chamber, 50, 51, 86, 90 half of eye, 49 half, removing vitreous from, 49 surface of lens, 55 Aperture, increasing pupillary, 106, 107, 109 Aqueous humor, 51 Arteria centralis retinæ, 43, 49 Arteries, ciliary, 72 course of retinal, 111 Artery of retina, central, 43, 49 hyaloid, 43 B Beef eyes, 26, 27 Beginning of dissection of orbital contents, 97 Benzine, 59 Blood-vessels of retina, 106 Blowing through blowpipe, folding retina by, 81, 82 Blowpipe, folding retina by blowing through, 81, 82 glass, 35 using it to force out vitreous, 78-81 Body, hyaloid, 41 Boiling crystalline lens, 55, 56 Books, text, 23, 25, 46, 52 C Canal, hyaloid, 43 of Petit, 35-37 Canaliculi, puncta, papilla, and nasal duct, locating, 92-95 Capsule of lens, 33, 50, 54 of lens, removing, 59 Capsule of Tenon, 115 of Tenon and conjunctiva, 116 Cedar oil, 60 Cells of processes, pigment, 49, 50 Central artery of retina, 43, 49 Chamber, anterior, 50, 51, 86, 90 posterior, 50, 51, 86, 90 Chemicals, 22, 23 Chisel and hammer, use of, 99-101 Choroid, 62 and sclerotic, cutting them away for isolating retina, 83 emptying, 69, 70 for dissecting three tunics, removing, 122 from sclerotic, for dissection of three tunics and hyaloid, loosening, 120 iridescence of, 45 loosening from corneo-scleral junction, 64, 65 loosening sclerotic from, 64, 66, 67, 68 or retina, removing cornea for isolating, 62, 63, 64 picking up retina and, 30, 31 preparing eye for isolating, 62 preserving isolated, 72 removing, 46 removing lens from, 69, 70, 71 scraping sclerotic from, 68 separating sclerotic from, 27, 29 Cilia and other superficial accessories, 95