Appendicitis is a mark, not a result, of a high grade of civilization. To have had an operation for it is one of the insignia of modern rank and culture. Our new biologic aristocracy, the "Appendix-Free," look down with gentle disdain upon their appendiciferous fellows who still bear in their bodies this troublesome mark of their lowly origin. In short, the general impression prevails that appendicitis is a new disease, a disease which has become common, or perhaps occurred at all, only within the last quarter of a century, and which therefore—with the usual flying leap of popular logic—is a serious menace to our future, if it keeps on increasing in frequency and ferocity at anything like the same rate which it has apparently shown for the past fifteen years.

As this feeling of apprehension is in many minds quite genuine, it may be well to say briefly, before proceeding further, first, that, if there be any disease which absolutely and almost exclusively depends upon definite peculiarities of structure, it is appendicitis, and that these structural peculiarities of this tiny, cramped tag of the food-canal have existed from the earliest infancy of the race. So it is almost unthinkable that man should not have been subject to fatal disturbances of this organ from the very earliest times. On the post-mortem table, the appendix of the lowest savage is the same useless, shriveled, and inflammable worm as that of the most highly civilized Aryan, though perhaps an inch or so longer. Secondly, there is absolutely no adequate proof that appendicitis is increasing in frequency among civilized races. It is only about twenty-five years ago that it was first definitely described, and barely fifteen that the profession began at all generally to recognize it.

But all of us whose memory extends backward a quarter of a century can clearly recall that, while we did not see any cases of "appendicitis," we saw dozens of cases of "acute enteritis," "idiopathic (self-caused) peritonitis," "acute inflammation of the bowels," "acute obstruction of the bowels," of which patients died both painfully and promptly, and which we now know were really appendicitis.

In short, from a careful study of all the data, including the claims so frequently made of freedom from appendicitis on the part of Oriental races, colored races, less civilized tribes, vegetarians, and others, we are tending toward the conclusion that the percentage of appendicitis in a given community is simply the percentage of its recognition,—in other words, of the intelligence and alertness, first of its physicians, and then of its laity. As an illustration, my friend Dr. Bloodgood kindly had the statistics of the surgical patients treated in the great Johns Hopkins Hospital at Baltimore investigated for me, and found almost precisely the same percentage of cases of appendicitis among colored patients as among white patients.

The earlier impression, first among physicians and now in the laity, that appendicitis is an almost invariably fatal disease, is not well founded, and we now know that a large percentage of cases recover, at least from the first attack; so that it is quite possible for from half to two-thirds of the cases of appendicitis actually occurring in a given community to escape recognition, unless promptly reported, carefully examined, and accurately diagnosed. Thirdly, in spite of the remarkable notoriety which the disease has attained, the general dread of its occurrence,—which has been recently well expressed in a statement that everybody either has had it, or expects to have it, or knows somebody who has had it,—the actual percentage of occurrence of grave appendicitis is small. In the United States census of 1900, which was the first census in which it was recognized as a separate cause of death, it was responsible for only 5000 deaths in the entire United States for the ten years preceding, or about one death in two hundred. This rate is corroborated by the data, now reaching into thousands, from the post-mortem rooms of our great hospitals, which report an average of between a half and one per cent. A disease which, in spite of the widespread terror of it, kills only one in two hundred of those who actually die—or about one in every ten thousand of our population—is certainly nothing to become seriously excited over from a racial point of view.

While appendicitis is one of the "realest" and most substantial of diseases, and, in its serious form, highly dangerous to life, there can be little doubt that there has come, first of all, a state of mind almost approaching panic in regard to it; and, second, a preference for it as a diagnosis, as so much more distingué than such plebeian names as "colic," "indigestion," "enteritis," or the plain old Saxon "belly-ache," which has reached almost the proportions of a fad. It is certain that nowadays physicians have almost as frequently to refuse to operate on those who are clamoring for the distinction, as to urge a needed operation upon those unwilling to submit to it.

The satirical proposal that a "closed season" should be established by law for appendicitis as for game birds, during which none might be taken, would apply almost as often to the laity as to the profession, even the surgical half.

Since the chief cause of appendicitis is the appendix, the first question for disposal is, How did the appendix become an appendix? To this biology can render a fairly satisfactory answer. It is the remains of one of Mother Nature's experiments with her 'prentice hand upon the mammalian food-tube. As is now generally known, the food-canal in animals was originally a comparatively straight tube, running the length of the body from mouth to anus. It early distends into a moderate pouch, about a third of the way down from the mouth, forming a stomach, or storage and churning-place for the food. Below this, it lengthens into coils (the so-called small intestine), which, as the body becomes more complex, increase in number and length until they reach four to ten times the length of the body. Later, the lower third of the tube distends and sacculates out into a so-called large intestine, in which the last remnants of nutritive material and of moisture are extracted from the food-residues before they are discharged from the body. Just at the junction of this large intestine with the small intestine, nature took it into her head to develop a second pouch, a sort of copy of the stomach. This pouch, from the fact that it ends in a blind sac, is known as the cæcum (or "blind" pouch), and is apparently simply a means of delaying the passage of the foodstuffs until all the nutriment and moisture have been absorbed out of them for the service of the body. Naturally, it has developed to the largest degree and size in those animals which have lived upon the bulkiest and grassiest of foods, the so-called Herbivora, or grass-eaters. In the Carnivora, or flesh-eaters, it is usually small, and in one family, the bears, entirely absent. This pouch is no mere figure of speech, as may be gathered from the fact that in certain of the rodent Herbivora, like the common guinea-pig, it may have a capacity equal to all of the rest of the alimentary canal, and in the horse it will hold something like four times as much as the stomach. Oddly enough, among the grass-eaters, for some reason which we do not understand, it appears to occur in a sort of inverse proportion to the stomach; those which have large, sacculate, pouched stomachs, like the cow, sheep, and the ruminants generally, having smaller cæca. In other Herbivora with small stomachs, like the rabbit and the horse, it develops greater size.

Our primitive ancestors were mixed feeders, and, though probably more largely herbivorous than we are to-day, had a medium-sized cæcum, and maintained it up to the point at which the anthropoid apes began to branch off from our family-tree. But at about this point, for some reason, possibly connected with the increasing variety and improved quality and concentration of the food, due to greater intelligence and ability to obtain it, this large cæcum became unnecessary, and began to shrivel.

Here, however, is where nature makes her first afterthought mistake. Instead of allowing this pouch to contract and shrivel uniformly throughout its entire length, she allowed the farther (or distal) two-thirds of it to shrivel down at a much faster rate than the central (or proximal) third; so that the once evenly distended sausage-shaped pouch, about six to eight inches long and two inches in diameter, has become distorted down into a narrow, contracted end portion, about a quarter of an inch in diameter, and a distended first portion, for all the world like a corncob pipe with a crooked stem and an unusually large bowl. And behold—the modern appendix vermiformis, with all its fatal possibilities!