The chemicals needed are few in number and small in quantity: Alcohols in varying strength, which can be made by diluting a 95 per cent. alcohol, and keeping an absolute alcohol on hand. A few ounces of formaldehyde will make enough solutions of different strengths to be sufficient for the preparation and keeping of many specimens. Of other chemicals, such as xylol and cedar oil, only small quantities are needed; enough to cover a specimen. Fifteen to twenty cents worth of each will be an ample supply to keep on hand. All of these may be procured at any large drug store, and are the only chemicals required for doing the dissections as explained in this book. Before further advance is made, it will be best to state that this work deals only with methods for dissecting the various parts of an eye, and is primarily intended to aid in the study of the anatomy and physiology of the eye by being used in conjunction with such books as “Gray’s Anatomy,” “A Text-Book of Physiology,” by Howell, “The Anatomy and the Physiology of the Eye,” by Brown and Zoethout, and similar other works of authority. However, if it is desired to acquire only specimens, then, of course, no other works are necessary, and the matter contained herein is sufficient to enable one to procure just what is wanted. It is also wise to state here that since human eyes are hard to procure, and not available in large quantities, one must resort to the use of the eyes of animals, which are procurable in large quantities, and which may be used without “feelings” in the matter. Though there is a difference between the eyes of human beings and the eyes of other animals, the difference is slight and of minor importance when compared with the similarity of the more important parts. TECHNIQUE OF EYE DISSECTIONS REMOVAL OF THE HYALOID MEMBRANE WITH CONTENTS AND ATTACHMENTS INTACT[1][2] One of the easiest and most satisfactory dissections to attempt is the isolating of the hyaloid membrane with its contents and its attachments. The success one meets with in making this dissection will surely prove a strong incentive for making all the rest. For these reasons this has been placed first in this arrangement. In eye dissections it is quite customary, in giving directions for dissections, merely to mention the hyaloid membrane and its relations with other parts of the eye. Rarely is there any attempt made to isolate it. Often, too, the retina is mistaken for the hyaloid, and the retina then wrongly demonstrated as being attached to the choroid. Of course, it is impossible to separate the hyaloid from the vitreous; but a dissection can be made which, when placed in a glass of some kind, will show the hyaloid. If the following simple technique is carefully observed, the membrane, with all its connections, can be easily separated from certain other parts of the eye. Opportunity for thorough study and observation will then be made extremely easy.