COMPOSITE SAMPLING 



53 



Fig. 16.-MUk 

 sampler. 



Fig 17 — 

 Scovell 

 sampling 

 tube. 



where children, and others unfamiHar with their poison- 

 ous properties, can not have access to them. 



The bichromate of potash and corrosive subhmate can 

 be purchased in tablet form, each tablet containing enough 

 preservative to keep a pint of *^ilk sweet for about two 



