Again, it is clearly explained in the philosophy how the introduction of poison into the body may produce subluxations and thus cause an interference with transmission and reduce the adaptative action on the part of Innate to the poison introduced. The student is referred to Volume V, Chiropractic Library, for further explanation on this point. Sources of Communication Generally speaking, there are two main sources whereby dis-ease is communicated: (a) man himself; (b) the animals. Almost all of the so-called communicable dis-eases of man are peculiar to man alone and are not found in animals except as they are communicated to them for experimental purposes. It is interesting to note that the lower animals are much more free from contagious dis-eases than man. As a matter of fact, the lower animals are seldom found to be infected. It is true that the domesticated animal is more susceptible to dis-ease than the wild animal living in the natural state. Following is a list commonly given as communicable dis-eases peculiar to man and according to medical theory communicable from man to man. Even among those who accept this theory there is quite a difference of opinion as to the dis-eases that should be included in this list. Smallpox, chickenpox, cholera, leprosy, dengue, relapsing fever, measles, mumps, scarlet fever, infantile paralysis, typhus fever, yellow fever, malaria, syphilis, tuberculosis and typhoid fever. It is maintained by hygienists that the greatest source of infection is man himself. No longer is it thought that the environment is the main source of infection. It is believed by Rosenau and others that the water, soil, air and food may be the media conveying dis-ease from man to man; these, however, are not now considered as the main source of infection. Rosenau says, “Most of the microörganisms causing the communicable dis-eases of man are frail and soon die in our environment, as in the air, soil or water. Most of them are obligate pathogens and can not, or do not, grow and multiply under the adverse conditions of our environment.” And yet these frail little creatures are supposed to cause dis-ease in man. We wish the student to bear this in mind for we will have more to say in this respect later on. It is sufficient to state here that the above named dis-eases maintained by some to be caused by germs are corrected by chiropractic adjustments. Chiropractic has proven that instead of dis-ease being caused by the germ the germ is produced by the dis-ease. CHAPTER II HOUSING HYGIENE HOUSING HYGIENE GENERAL CONSIDERATIONS SITE RELATION TO HEALTH EFFECT OF DAMP SITE ASPECT MOST SUITABLE ARRANGEMENT OF ROOMS DIRECT RAYS OF THE SUN Soil RELATION TO HEALTH MOST SUITABLE SOIL