530 TEXTBOOK OF BOTANY 



Most of these methods were found out accidentally because the true 

 nature of putrefaction and diseases was unknown for man\' centuries, 

 and these methods are consequenth crude and often not dissociated 

 from magic. There is now a great body of experimentally established 

 facts about the control of bacteria. In the references below, further 

 information mav be secured about the effectiveness and uses of the 

 following means of controlling bacteria: cleanliness, ventilation, sun- 

 light, drving, refrigeration, antiseptics, brine and sugar solutions, steri- 

 lization, fumigation, pasteurization, canning, precipitation by chemicals, 

 isolation, vaccination, antitoxins, and serum treatment. 



REFERENCES 



Gay, F. P., and associates. Agents of Disease and Host Resistance. Charles C. 



Thomas, Publisher. 1935. 

 Henrici, A. T. The Biology of Bacteria. 2nd ed. D. C. Heath & Company. 



1939. 

 Oparin, A. I. The Origin of Life. The Macmillan Company. 1938. Chaps. ITII. 

 Parker, G. H. Anthony van Leeuwenhoek and his microscopes. Sci. Monthly. 



37:434-441. 1933. 

 Salle, A. J. Fundamental Principles of Bacteriology. McGraw-Hill Book Com- 

 pany, Inc. 1939. 

 Stanley, W. M. Recent advances in the study of viruses. Science in Progress 



(G. A. Baitsell, ed.). Yale Univ. Press. 1939. Chap. III. 

 Vallery-Radot, R. The Life of Pasteur. Doubleday, Doran & Company, Inc. 



1928. 

 Watkeys, C. W., and associates. An Orientation in Science. McGraw-Hill Book 



Company, Inc. 1938. Chap. X. 



