1896] 



MICROSCOPICAL JOURNAL. 



93 



TABLE NO. 3.— FILTRATION EXPERIMENTS.— MORRISON'S FILTER. 



Growth of about ninety hours, of water bacteria in tlie sample of applied and tiltered water 

 which were taken at tlie same hour; which was one hour or more after the water commenced to 

 flow from the filter. 



COMMENCED TO USE THE BACILLUS PRODIGIOSUS. 



CEASED TO USE BACCILLUS PRODIGIOSUS. 



WASHED FILTER BED WITH CAUSTIC SODA. 



