296 PROCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE. 

 Table V. — -Continued. 



This table supports the data given in Table IV. An investigation is under 

 way to determine upon a formula for con-ecting for the error caused by 

 volume of soil that is taken as part of the aliquot. 



The largest error occurs in taking the first aliquot from the 1-4 bacterial 

 dilution first made up. Calculations are given in Table VI of the effect of 

 errors in measuring 10 cc and 1 cc aliquots on l-K), and 1-400 l)acterial 

 dilutions. 



Taiilk VI. 

 Effect of errors in measuring on bacterial dilutions. 



Bacterial Dilutions Desired. 



1-40 



1-400 



Error — minus .01 cc 



10 cc pipette. . . 



1 cc pipette. . . 



Error — minus .02 cc 



10 cc pipette. . . 



1 cc pipette. . . 



Error — minus .03 cc 



10 cc pipette . . 



1 cc pipette, . . 



400 4 

 404 



400 

 408 



401.1 

 412.2 



4 , 004 . 

 4 , 040 . 



4 , 007 , 

 4,081. 



4,011. 

 4,122. 



