142 



The initial chlorinity was determined within four days 

 after collection. The final chlorinity was titrated 

 three and one-half months after collection. 



Polyethylene bottle A was capped with an ordinary plastic 

 screw cap. 



The citrate bottle B was standard with a glass cap and a 

 rubber ring seal. 



Polyethylene bottle C was capped with a plastic-cone-seal 

 screw top. This latter type of seal was the standard 

 used on this survey. 



