A civic biology - presented in problems (c1914) (20644813482)

Title: A civic biology : presented in problems
Identifier: civicbiologypres00hunt (find matches)
Year: c1914 (c190s)
Authors: Hunter, George W. (George William), 1873-1948
Subjects: Biology; Sanitation
Publisher: New York : American Book Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library



Text Appearing Before Image:
152 PLANTS WITHOUT CHLOROPHYLL part of the food tube. Some in the food tube are believed to be useful, some harmless, and some harmful; others in the mouth cause decay of the teeth, while a few kinds, if present in the body, may cause disease. It is known that bacteria, like other living things, feed and give off organic wraste from their own bodies. This waste, called a toxin,
Text Appearing After Image:
Tubercles on the roots of the soy bean. They contain the nitrogen-fixing bacteria. (Fletcher's Soils.) Copyright by Doubleday, Page and Company. is poison to the host on which the bacteria live, and it is usually the production of this toxin that causes the symptoms of disease. Some forms, however, break down tissues and plug up the small blood vessels, thus causing disease. Diseases caused by Bacteria.- -It is estimated that bacteria cause annually over 50 per cent of the deaths of the human race. As we will later see, a very large proportion of these diseases might be prevented if people were educated sufficiently to take the proper precautions to prevent their spread. These pre- cautions might save the lives of some 3,000,000 of people yearly in Europe and America. Tuberculosis, typhoid fever, diphtheria, pneumonia, blood poisoning, syphilis, and a score of other germ diseases ought not to exist. A good deal more than half of the present misery of this world might be prevented and this earth made cleaner and better by the cooperation of the young people now growing up to be our future home makers. How we take Germ Diseases. - - Germ or contagious diseases either enter the body by way of the mouth, nose, or other body