Variations from 8.15 to 0.96 per cent in the glycerol yield from twelve dogfish (Squalus suckleyi) liver oils are reported and shown to be inversely related to their 7.6 to 34.3 per cent yield of unsaponifiable matter, or, better, to their 6 to 31 per cent yield of glyceryl ethers. The glycerol determinations are confirmed by an independent method involving a comparison of the hydroxyl group and replaceable hydrogen contents of the hydrolyzed oils.