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A small piece of bone, ground very thin and highly magnified. "If a bit of bone is still more magnified we find that very small cavities called lacunae lie between the lamelae; from each lacuna radiate many extremely fine tubes, the canaliculi, so that it looks like a small animal with a great many legs. The innermost canaliculi open into the Haversian canal of the system to which they belong, and those of various lacunae communicate with one another, so that a set of passages is provided through which liquid which transudes from the blood vessel in the Haversian canal can ooze through the bone." —Newell, 1900.

Section of Bone

A small piece of bone, ground very thin and highly magnified. "If a bit of bone is still more magnified…

Surface view of part lamella of kitten's cornea, prepared first with caustic potash and then with nitrate of silver. By this method the branched cornea-corpuscles with their granular protoplasm and large oval nuclei are brought out.

Lamella of Kitten's Cornea

Surface view of part lamella of kitten's cornea, prepared first with caustic potash and then with nitrate…

Vertical section of rabbit's cornea, stained with gold chloride. Labels: e, Laminated anterior epithelium. Immediately beneath this is the anterior elastic lamina of Bowman. n, Nerves forming a delicate sub-epithelial plexus, and sending up fine twigs between the epithelial cells to end in a second plexus on the free surface; d, Descemet's membrane, consisting of a fine elastic layer, and a single layer of epithelial cells. the substance of the cornea, f, is seen to be fibrillated, and contains many layers of branched corpuscles, arranged parallel to the free surface, and here seen edgewise.

Section of Rabbit's Cornea

Vertical section of rabbit's cornea, stained with gold chloride. Labels: e, Laminated anterior epithelium.…

Lamellae torn off from a decalcified human parietal bone at some depth from the surface. Labels: a, lamellae, showing reticular fibers; b, darker part, where several lamellae are superposed; perforating fibers. Apertures through which perforating fibers has passed, are seen especially in the lower part of the figure.

Lamellae

Lamellae torn off from a decalcified human parietal bone at some depth from the surface. Labels: a,…

Shown is a thin layer peeled off from a soft bone, which is intended to represent the reticular structure of a lamella.

Reticular Structure of a Lamellae

Shown is a thin layer peeled off from a soft bone, which is intended to represent the reticular structure…

"Portions of sections through the disc of medusae. The upper one of Lizzia, the lower of Aurelia. el, endoderm lamelia, or vascular lamelia; m, muscular processes of the ectoderm cells in cross section; d, ectoderm; en, endoderm lining the enteric cavity; e, wandering endoderm cells of the gelatinous substances." — Encyclopedia Britannica, 1893

Medusae

"Portions of sections through the disc of medusae. The upper one of Lizzia, the lower of Aurelia. el,…