EXPLANATION OF THE PLATES. 227
PLATE III.
Fig. 1. From the point of a branchial cartilage of Rana esculenta. The lower margin of the delineation exhibits the natural border of the cartilage.
2. Cartilage from the ilium of a foetal pig five inches long, after the application of acetic acid.
3. Enamel fibres from immature teeth of a foetal pig.
4. Cells from the surface of the enamel membrane.
5. Fibres which compose the substantia propria of the human tooth, isolated by maceration for two days in dilute hydrochloric acid.
6. Fibre-cells from the areolar tissue lying beneath the superficial muscles of the neck of a foetal pig measuring seven inches.
7. A more fully developed cell of areolar tissue.
8. Cells from the gelatinous substance between the chorion and amnion of a foetal pig seven inches long.
9. Larger and very pale cells from the areolar tissue of the orbital cavity of the same foetus.
10. Fat-cells from the cranial cavity of the young of Cyprinus erythrophthalmus.
11. Fibre-cells from the tendo achillis of a foetal pig three and a half inches long.
12. From the middle coat of the aorta of a fetal pig measuring seven inches in length.
13. Cells from the interior of the quadratus lumborum muscle of a foetal pig three and a half inches long.
