favor the solution of the moral problems which it now obscures.

Chapter III

The Nature and Course of Syphilis

The simplest and most direct definition of syphilis is that it is a contagious constitutional disease, due to a germ, running a prolonged course, and at one time or another in that course is capable of affecting nearly every part of the body. One of the most important parts of this rather abstract statement is that which relates to the germ. To be able to put one's finger so definitely on the cause of syphilis is an advantage which cannot be overestimated. More than in almost any other disease the identification of syphilis at its very outset depends upon the seeing of the germ that causes it in the discharge from the sore or pimple which is the first evidence of syphilis on the body. On our ability to recognize the disease as syphilis in the first few days of its course depends the greatest hope of cure. On the recognition of the germ in the tissues and fluids of the body has depended our knowledge of the real extent and ravages of the disease. With the knowledge that the germ was related to certain other more familiar forms, Ehrlich set the trap for it that culminated in salvarsan, or "606," the powerful drug used in the modern treatment. By the finding of this same germ in the nervous system in locomotor ataxia and general paralysis of the insane, the last lingering doubt of their syphilitic character was dispelled. Every day and hour the man who deals with syphilis in accordance with the best modern practice brings to bear knowledge that arises from our knowledge of the germ cause of syphilis. No single fact except perhaps the knowledge that certain animals (monkeys and rabbits especially) could be infected with it has been of such immense practical utility in developing our power to deal with it.

The germ of syphilis,[3] discovered by Schaudinn and Hoffmann in 1905, is an extremely minute spiral or corkscrew-shaped filament, visible under only the highest powers of the microscope, which increase the area of the object looked at hundreds of thousands of times, and sometimes more than a million of times. Even under such intense magnifications, it can be seen only with great difficulty, since it is colorless in life, and it is hard to color or stain it with dyes. Its spiral form and faint staining have led to its being called the Spirochæta pallida.[4] It is best seen by the use of a special device, called a dark-field illuminator, which shows the germ, like a floating particle in a sunbeam, as a brilliant white spiral against a black background, floating and moving in the secretions taken from the sore in which it is found. Some means of showing the germ should be in the hands of every physician, hospital, or dispensary which makes a claim to recognize and treat syphilis.

Syphilis a Concealed Disease.—Syphilis is not a grossly conspicuous figure in our every-day life, as leprosy was in the life of the Middle Ages, for example. To the casually minded, therefore, it is not at all unreasonable to ask why there should be so much agitation about it when so little of it is in evidence. It takes a good deal out of the graphic quality of the thing to say that most syphilis is concealed, that most syphilitics, during a long period of their disease, are socially presentable. Of course, when we hear that they may serve lunch to us, collect our carfare, manicure our nails, dance with us most enchantingly, or eat at our tables, it seems a little more real, but still a little too much to believe. Conviction seems to require that we see the damaged goods, the scars, the sores, the eaten bones, the hobbling cripples, the maimed, the halt, and the blind. There is no accurate estimate of its prevalence based on a census, because, as will appear later, even an actual impulse to self-betrayal would not disclose 30 to 40 per cent of the victims of the disease. Approximately this percentage would either have forgotten the trivial beginnings of it, or with the germs of it still in their brains or the walls of their arteries or other out-of-the-way corners of their bodies, would think themselves free of the disease—long since "cured" and out of danger.

How Much Syphilis is There?—Our entire lack of a tangible idea of how much syphilis there really is among us is, of course, due to the absence of any form of registration or reporting of the disease to authorities such as health officers, whose duty it is to collect such statistics, and forms the principal argument in favor of dealing with syphilis legally as a contagious disease. Such conceptions of its prevalence as we have are based on individual opinions and data collected by men of large experience.

Earlier Estimates of the Prevalence of Syphilis.—It is generally conceded that there is more syphilis among men than women, although it should not be forgotten that low figures in women may be due to some extent to the milder and less outspoken course of the disease in them. Five times more syphilis in men than women conservatively summarizes our present conceptions. The importance of distinguishing between syphilis among the sick and among the well is often overlooked. For example, Landouzy, in the Laënnec clinic in Paris, estimated recently that in the patients of this clinic, which deals with general medicine, 15 to 18 per cent of the women and 21 to 28 per cent of the men had syphilis. It is fair to presume, then, that such a percentage would be rather high for the general run of every-day people. This accords with the estimates, based on large experience, of such men as Lenoir and Fournier, that 13 to 15 per cent of all adult males in Paris have syphilis. Erb estimated 12 per cent for Berlin, and other estimates give 12 per cent for London. Collie's survey of British working men gives 9.2 per cent in those who, in spite of having passed a general health examination, showed the disease by a blood test. A large body of figures, covering thirty years, and dating back beyond the time when the most sensitive tests of the disease came into use, gives about 8 per cent of more than a million patients in the United States Public Health and Marine Hospital Service as having syphilis. It should be recalled that this includes essentially active rather than quiescent cases, and is therefore probably too low.

Current Estimates of the Prevalence of Syphilis.—The constant upward tendency of recent estimates of the amount of syphilis in the general population, as a result of the application of tests which will detect even concealed or quiescent cases, is a matter for grave thought. The opinion of such an authority as Blaschko, while apparently extreme,