Leptinite, a fine-grained granitic rock.
Loam, a soil composed of siliceous sand, clay, carbonate of lime, oxide of iron, magnesia, and various salts, and also decayed vegetable and animal matter.
Loess, a term usually applied to a tertiary deposit on the banks of the Rhine.
Lumbar, the vertebræ near the loins.
Mammalia, that class of animals characterized by the female suckling its young.
Marl, a mixed earthy substance, consisting of carbonate of lime, clay, and siliceous sand.
Mastoid, a process situated at the posterior part of the temporal bone.
Matrix, a mould; the cavity in which a thing is held.
Maxillary, the upper jaw bone.