xxx CONTENTS 



Section X. Filtrable viruses in the Pasteur elloses, - 842 



Section XI. The virus of Swine-fever, - 843 



Section XII. The virus of Acute anterior polio-myelitis, - 844 



Section XIII. The virus of Typhus fever, - - 847 



PART VII. THE APPLICATION OF BACTERIOLOGICAL METHODS 

 TO THE EXAMINATION OF WATER, SEWAGE AND AIR. 



LXV. The bacteriological examination of water. 



Introduction, - 851 



'Section I. The collection and transmission of samples of 



water, - - 851 



Section II. The methods of examination, 853 



(1) Enumeration of the organisms, p. 853. (2) Determination of the 

 nature of the organisms present, p. 856. (3) Houston's method of 

 water examination, p. 858. 



The bacteriological examination of sewage, p. 861. 



LXVI. The bacteriological examination of air. 



Introduction, - - 862 



1. Original methods, p. 862. 2. Methods employed at the present 

 day, p. 864. 



Index, - 868 



