still further by other scientists, with the result that bacteriology has revolutionized medicine, agriculture, and many industries, and has made possible the brilliant achievements of modern sanitary science. For the first time in history the prevention of epidemics has become possible, and sickness is no longer regarded as a punishment for sin.

Actual care of the sick, both in homes and in hospitals, has always been one of the responsibilities of women. The first general public hospital was built in Rome in the 4th century after Christ by Fabiola, a patrician lady. There she nursed the sick with her own hands, and from her day to ours extends an unbroken line of devoted women, handing down through the

centuries their tradition of compassionate nursing service. It remained for Florence Nightingale, however, to give to the training its technical and scientific foundation, and thus to found the profession of nursing. As a result of her work, effectiveness was added to the spirit of service, that spirit which inspires the modern nurse no less than in an earlier day it inspired the Sisters of Charity who died nursing the wounded on the battlefields of Poland.

But different generations have different needs, and to meet them the spirit of service must manifest itself in widely varying ways. The sick need care today no less than they did when St. Elizabeth bathed the feet of the lepers; but such limited service, however beautiful, is no longer enough. Today we serve best by preventing sickness. Cure of sickness and alleviation of suffering must never be neglected; not in cure, however, but in prevention lies the hope of modern sanitary science, of modern medicine, and of modern nursing.

Nearly every woman at some time in her life is called upon to assist in caring for the sick. Indeed, approximately 90% of all sick persons in the United States are cared for at home, even in cities where hospital facilities are good. Moreover, every woman is largely responsible for maintaining her own health, and few escape

responsibility at some time for maintaining the health of others. For such responsibility most women are poorly prepared. Every year in our own country thousands of persons, many of them babies and children, die merely because someone, in many cases a woman, is fatally ignorant of the laws governing sickness and health.

Only prolonged and careful training, such as good hospital training-schools afford, can furnish the skill and judgment required in nursing persons who are seriously ill. Upon the trained nurse the modern practice of medicine makes great and ever-increasing demands: a nurse must perform complicated duties, meet critical situations, and carry out a wide variety of measures based on scientific principles which she must understand. Good will and sympathy are no longer enough; amateur nursing, even when performed with the best intentions, may involve grave dangers for those who are seriously ill.

On the other hand, although it is true that a little knowledge is a dangerous thing, it is no less true that total ignorance may be more dangerous still. For instance, in cases of incipient, slight, or chronic illness, and in certain emergencies a little knowledge may be safer far than no knowledge at all; and no one, surely, should be ignorant of the principles of hygiene.

The American Red Cross, recognizing the part that women can and should play in preventing sickness and in building up the health and vigor of the nation, has added to its larger patriotic services this elementary course of instruction in hygiene and home care of the sick. The lessons are not intended to take the place of a nurse's training, and procedures requiring technical skill are necessarily omitted. The object of the book is to supply a little knowledge of sickness, which though limited may yet be safe. The book is also designed to set forth some general laws of health; to make possible earlier recognition of symptoms; to teach greater care in guarding against communicable disease; and to describe some elementary methods of caring for the sick, which, however simple, are essential to comfort, and sometimes indeed to ultimate recovery.

FOR FURTHER READING

• A History of Nursing—Dock and Nutting, Volume I.
• The Life of Florence Nightingale—Cook.
• The Life of Pasteur—Vallery-Radot.
• The House on Henry Street—Wald.
• Public Health Nursing—Gardner, Part I, Chapters I-III.
• Origin and Growth of the Healing Art—Berdoe.
• Medical History from the Earliest Times—Withington.
• Under the Red Cross Flag—Boardman.
• Report on National Vitality—Fisher, (Bulletin 30 of the Committee of One Hundred on National Health. Government Printing Office, Washington).

CHAPTER I

CAUSES AND PREVENTION OF SICKNESS

Diseases of two kinds have long been recognized: first, those transmitted directly or indirectly from person to person, like smallpox, measles, and typhoid fever; and second, diseases like heart disease and apoplexy, which are not so transmitted. These two classes are popularly called "catching" and "not catching;" the former are the infectious or communicable diseases, and the latter the non-infectious or non-communicable. The term contagious, formerly applied to diseases supposed to be spread only by direct contact, is no longer an accurate or useful term.

THE COMMUNICABLE DISEASES

The invention of the microscope, as we have seen, revealed the existence of innumerable little plants and animals, so small that even many millions crowded together are invisible to the naked eye. These tiny living creatures are called micro-organisms or germs. The plant forms are called bacteria (singular, bacterium), and the animal

forms protozoa (singular, protozoön). The common belief that all or even most bacteria are harmful is quite unfounded. As a matter of fact, while not less than 1500 different kinds of micro-organisms or germs are known, only about 75 varieties are known to produce disease.

Most bacteria belong to the class of micro-organisms called saprophytes, which find their food in dead organic matter, both animal and vegetable, and cannot flourish in living tissues. These saprophytes act upon the tissues of dead animals and vegetables, and resolve them into simpler substances, which are then ready to serve as nourishment for plants higher in the vegetable kingdom. Thus the processes which we know as fermentation and putrefaction are due to the action of saprophytes. Higher plants in turn furnish food for men and animals, and so the food supply is used over and over in different forms, making what is known as the food cycle. If it were not for bacterial activities vegetation would be robbed of its supply of nourishment, and plant life would speedily end; destruction of plant life would deprive the animal kingdom of food and thus all life would become extinct. The saprophytes are consequently essential to the existence of both animals and vegetables.

There are, however, other organisms called

parasites, which can exist in living tissues of animals or vegetables. The organisms at whose expense the parasites live are called their hosts. Parasites not only contribute nothing to their hosts, but generally harm them by producing poisonous substances or depriving them of food. Some parasites are able to lead a saprophytic existence also, but as a