G UM MER for his help in th e prepara tion of this article. Filiall y, I should lik e to ex press m y gratit ude to MISS P AMELA DIX for h er help wi th th e /> h otog raphs. REFERE:'\CES n ell , n. l\r. (19:', ; ) 'Torsion of Gall Bladd er', n-« . med, J.