THE taurine conjugates of cholic and chenodeoxycholic acid1 are preponderant bile acids of murine bile. The systematic names of the bile acids referred to in the text are: taurocholic acid, 3α, 7α, 12α-trihydroxy-5β-cholanyl taurine; taurochenodeoxycholic acid, 3α,7α-dihydroxy-5β-eholanyl taurine; taurolithocholic acid, 3α-hydroxy-5β-cholanyl taurine; lithocholic acid, 3α-hydroxy-5β-cholanic acid. Although these bile acids are excreted as the sodium salts, by convention they are often referred to in the acid form. In this communication the suffix, ‘-ate’, is used to indicate the sodium salt. Intravenous administration of taurocholate to rats is known to result in increased bile flow and bile acid excretion2.