Abstract
If there is any one point in the region of the anus, rectum and sigmoid that is of more clinical importance than another, it is the anal canal. Yet, since the description of my inflatable rectal speculum (pneumatic proctoscope) was published,<sup>1</sup>in 1899, most of the inventive genius has been exerted toward improving that instrument rather than the anoscope. Of the diseases that occur in these organs, 75 per cent. or more involve this canal, and practically all of them are infective. Because of the functions of the muscles that encircle and close this canal, a satisfactory inspection of the field, and the administration of treatment thereto is very difficult with the ordinary anoscope, which is usually conical and not self-retaining. Numerous instruments have been designed to aid in inspecting this canal, but none are satisfactory. The anoscope illustrated herewith is self-retaining, and gives a more complete and satisfactory
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