158 SUBJECT INDEX. 



PAGE 



Paris, bacteria in air of. 8 



Parma, B. coli in water supply of. 78 



in wells and springs near 78 



Peabody tap-water, bacteria in IO, 47 



Peptone method for isolation of cholera bacillus 56 



solution, preparation of 124 



test 71 



Period of incubation 31 



Phenol broth, composition of 62 



, method for isolation of B. coli 62 



, preparation of. 125 



Phenolated gelatin, use of, for typhoid isolation 50 



lactose litmus agar 60 



Plating 28 



in the field 34 



Plymouth tap-water, bacteria in. 10, 47 



Polluted waters, bacterial changes during storage 27 



, blood temperature count 45 



, lactose fermenting bacteria in 48 



, specific pathogenes in 49 



Ponds, bacteria in 10, 47 



Pools, bacteria in , 47 



Potato, preparation of 124 



gelatin, use for typhoid bacteria 50 



Presumptive tests for B. coli 94 et seq. 



Proteus organisms 108 



Protozoa 1 2 



Prussia, regulations regarding filter plants 41 



Pseudocolon bacilli 68 



Pump, sampling from 23 



Pumping, effect of, upon bacterial content of well water 23 



Quantitative analysis arbitrary standards for 35 



composition of media 29 



conditions of incubation 31 



counting 33 



dilution 28 



general procedure 21 



interpretation of 35 



media for 19 



