None of the concentrations of salt inhibited the growth of E.coli. This indicates that K-12 E.coli isable to tolerate added salt of up to 10% concentration. However, the nutrient agar that the E.coli testplates were made with already contained a certain unknown concentration of salt. If the nutrient agarhad not contained any salt at all, then E.coli inoculated where the control (0%) and the discs withlower concentrations of salt were placed may have died by osmosis. Thus the results that concernedthe lower concentrations of salt were not entirely reliable. However, the higher concentrations mayhave still been viable although not as a higher boundry. So the hypothesis, that as the concentrationof salt increases the growth of E.coli decreases, was rejected because for all the concentrations of salttested, there was similar E.coli growth during the test period.To further improve this experiment, a nutrient broth containing no salt at all would be usedso that the affect of having 0% salt concentration could be accurately tested. Much higher saltconcentrations would also be tested. If more extreme concentrations of salt were used then the theE.coli cells growing in the extreme high and low concentration areas would die by osmosis. The E.coliin extremely low concentrations of salt would gain too much water or burst, and the E.coli in extremelyhigh concentration of salt would lose too much water in an effort to reduce the concentration gradientof salt inside and outside the bacteria cells.