134 EXAMINATION OF AIR, WATER, AND SOIL. 



flasks, in sterilized bottles having a ground-glass stopper, 

 or in Sternberg bulbs (Fig. 40). If the city water-supply is 

 to be examined, the sample may be taken directly from a 

 faucet after the water has been running for about half an 



FIG. 41. 



FIG. 42. 



Bulb pipette. 



FIG. 43. 



-*a~ -^ 



Bottle for collecting water. 



Graduated pipette. 



hour. If from other sources, the container is placed at the 

 depth at which it is desired to make the examination. The 

 bottle is uncorked and corked under the water, and hermeti- 

 cally sealed before it is transported (Fig. 41). Only sterile 

 flasks or bottles are used for collection. 



