Multiple comparison of means
All pairwise comparisons with Tukey's Honestly Significant Difference

Gives something like this:
Tukey multiple comparisons of means
95% familywise confidence level
Fit: aov(formula = lm(log(con) ~ trt, vetjoh))
$trt
diff lwr upr p adj
BA 0.2461650 0.5338651 0.04153517 0.1081573
CA 0.4277022 0.6963277 0.15907673 0.0008558
CB 0.1815373 0.4667678 0.10369329 0.2857137

