153 



Monday, November 15, pool freshly Ailed ISO None 



Evening, after use 23,100 Present 



Pool dosed with (580 grains chloride lime. 



Tuesday, November 16, a. m 26 None 



Evening, after use 12,000 Present 



Pool dosed with chloride of lime. 



Wednesday a. m., November 17 14 None 



Evening, after use (no sample). 

 Pool dosed with chloride of lime. 

 Thursday a. m., November 18, water had not been 



changed as was usually done 9 None 



Evening, after use (no sample). 

 Pool not dosed. 



Friday a. in., November 19 11,200 Present 



Evening, after use 20,500 Present 



Dosed with chloride of lime. 



Saturday, November 20 IS None 



Evening (uo sample). 



A study of the results shown on this table indicates that the effect of 

 the chloride of lime treatment is almost complete sterilization. The sam- 

 ples of water taken the morning after the water had been dosed in no case 

 showed more than 26 bacteria per cubic centimeter. And what I believe 

 to be a very important factor is that the general average of the bacteria 

 is lower, much lower, than during the week when the chemical was not 

 used. The effect of stopping the dosage is prettily shown in the Friday 

 morning sample, November 19. The pool is used by the "coeds*' and faculty 

 ladies on Thursday evenings, and it was inconvenient for the writer to 

 arrange to have the sample collected. No arrangement was made to have 

 the chemical applied. 



SUMMARY AND CONCLUSIONS. 



There are certain dangers to health in the indoor swimming pools. 

 The construction of the pools, the enforcement or neglect of rules govern- 

 ing those who use the pools, the proper attention to the water supply, as 

 to its purity before use by the bathers and after use, all have a direct 

 bearing on the extent of these dangers. 



