Scientia Sinica

Js

EXPLANATION OF PLATE III

Magnified photomicrograph of figure 4 of Plate V, showing disintegration of elastic cartilage. The new epidermis grows from upper right downward. The connective tissue is continuous with the cartilage. A, the mixing of the disintegrating cartilage and disintegrating leucocytes; B, the accumulation of a few newly-formed young cell nuclei. ;

Fixative: Susa, Staining: Mallory’s, Eyepiece: X 8, Objective: < 45. Photo: Leica colour film, x 5.7 3

Photomicrograph showing that, after the new epidermis has grown to a certain extent, the disintegiating tissues cease to develop into epidermis and turn to the formation of the connective tissue. A, the tip of the growing epidermis. In the middle part of the figure there are newlyformed young cell nuclei and young cells. Among them there are blue collagenous fibres. In the lower region of the figure the cartilage is disintegrating.

Fixative: Susa, Staining: Mallory’s sections parallel to the cartilage plate. The rest as above. Photomicrograph of a section parallel to the cartilage plate, The upper 1/3, dead cartilage; the lower 1/3, living cartilage; the middle 1/3, the growing epidermis with its papillae.

Fixative: Susa, Staining: Mallory’s, Eyepiece: X 8, Objective: 10. Photo: as above. Magnified photomicrograph of the rectangle in the above figure, showing the relation of the new-formed young cell nuclei and young cells with the disintegrating cartilage. A, disintegration of the cartilage. :

Eyepiece: 8, Objective: % 45.

Photomicrograph showing the penetration of the growing epidermis into the cartilage. Fixative, etc. as above. .