TECHNIC BACTERIOLOGICAL EXAMINATION OF SOILS. 



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in length and 2 inches in diameter, open at both ends. One end is sharpened 

 to a cutting edge. This cutting edge is so made that the core of soil is cut 

 out and the compaction of soil that is necessary in order to make room for 

 the sampler takes place outside the tube. The cutting end is fitted with a 

 tight fitting 2 inch brass cap. The uncapped end plugged with cotton makes 

 the sampler complete. This sampler embodies at least four of the principles 

 that a good sampler should have: (1) it is easily sterilized and kept sterile; 



Figure I — Dilution Bottle and Mixing Spoon. 



(2) it is easy to use; (3) it takes and keeps the soil sample free from con- 

 tamination; (4) it is durable." 



For Mixing the Soil Sample. 



For mixing the soil when it is taken from the sampler a two quart granite- 

 ware sauce pan and an aluminum spoon, tablespoon size, are used. The 

 aluminum spoon is bent so that it will fit the mouths of the 12 ounce dilution 

 bottles. Figure I. 



