TECHNIC BACTERIOLOGICAL EXAMINATION OF !>OILS. 



295 



In the above table the vohime of soil taken in the aliquot from the 1-40 

 bacterial dilution is ignored when 1 ce is taken, and used as one tenth the 

 volume taken from the 1-4 bacterial dilution when a 10 cc aliquot is taken. 



The tables present evidence that the 10 cc aliquots should be taken for a 

 chance clump of bacteria in the 1 ce aliquot fii'st taken would cause a much 

 greater error than the differences in bacterial dilutions calculated above. 



Table V is based on the same data as Table IV. The only difference 

 being that, as is recommended by some, the one cc aliquot is used to increase 

 the bacterial dilution 100 times at the start. 



Table V. 



Actual Bacterial dilutions made by taking 10 cc and Ice aliquots of 1-4 

 bacterial dilution. 



Soil 



AcidPeat 



10 cc 



1 cc 



Difference. . 



Peat 



10 cc 



1 cc 



Difference. . 



Acid Black Sand 



10 cc 



1 cc 



Difference. . 



Black Sand 



10 cc 



1 cc 



Difference. . 



Black sandy loam 



10 cc 



1 cc 



Difference . 



Sandy loam 



10 cc 



1 cc 



Difference . 



Silt Loam A 



10 cc 



1 cc 



Difference . 



