Lol, Though not a Xaverian, those two words reminded me of my good old days. "Froth flotation process", as far as I remember my chemistry, deals with getting something (don't remember exactly, maybe lead/silica from the ore) and "pheretima posthuma" deals with earthworm. Is that right Mr. Lonely? Had tough time toughing earthworm, burst into tears when dissected an earthworm for the first time.:) Wohooooooo good old high school days!