HOW PLANTS BENEFIT AND HARM MANKIND 183 



prevent the spread of germ diseases, especially in our homes. We 

 may keep our bodies, especially our hands and faces, clean. Sweeping 

 and dusting may be done with damp cloths so as not to raise a 

 dust; our milk and water, when from a suspicious supply, should be 

 sterilized, that is, the germs contained killed by boiling or pasteur- 

 izing for a few minutes. Wounds through which bacteria might 

 obtain foothold in the body should be washed with some antiseptic, 

 a substance like corrosive sublimate (1 part to 1000 water) or 

 carbolic acid (1 part to 40 water), which kills the germs. In a 

 later chapter we shall learn more of how we may cooperate with the 

 authorities to combat disease and make our city or town a better 

 place to live in. 1 



REFERENCE BOOKS 



ELEMENTARY 



Sharpe, A Laboratory Manual for the Solution of Problems in Biology. American 



Book Company. 



Conn, Bacteria, Yeasts, and Molds in the Home. Ginn and Company. 

 Conn, Story of Germ Life. D. Appleton and Company. 

 Davison, The Human Body and Health. American Book Company. 

 Frankland, Bacteria in Daily Life. Longmans, Green, and Company. 

 Prudden, Dust and its Dangers. G. P. Putnam's Sons. 

 Prudden, The Story of the Bacteria. G. P. Putnam's Sons. 

 Ritchie, Primer of Sanitation. World Book Company. 



ADVANCED 



Conn, Agricultural Bacteriology. P. Blakiston's Sons and Company. 



Coulter, Barnes, and Cowles, A Textbook of Botany, Vol. I. American Book Com- 

 pany. 



De Bary, Comparative Morphology and Biology of the Fungi, Mycetozoa, and Bacteria 

 Clarendon Press. 



Duggar, Fungous Diseases of Plants. Ginn and Company. 



Hough and Sedgwick, The Human Mechanism. Ginn and Company. 



Muir and Ritchie, Manual of Bacteriology. The Macmillan Company. 



Newman, The Bacteria. G. P. Putnam's Sons. 



Sedgwick, Principles of Sanitary Science and Public Health. The Macmillan Com 

 pany. 



1 Teachers may take up parts or all of Chapter XXIX at this point. I have 

 found it advisable to repeat much of the work on bacteria after the students 

 have taken up the study of the human organism. 



