Scientia Sinica

EXPLANATION OF PLATE I

. Photomicrograph of specimen taken after 13 hours, showing the formation of the scab. Scab in purple, normal tissues in blue. In the scab the upper is the blood clot and the lower is injured tissue with blood cells. The central blue column is the longitudinal section of the elastic cartilage. Fixative: Susa, Staining: Mallory’s, Eyepiece: %< 18, Objective: 10, Photo: Leica colour film, enlarged XX 5.7. Z

. Mignified photomicrograph of the rectangle in’ fig. 2 of Plate V, showing disintegration of the leucocytes at the tip of the growing epidermis. A and B, newly formed young cells. Fixative: Formalin, Staining: H, E. Eyepiece: % 8, Objective: & 100. Photo: as Fig. 1. Formalin, Staining: H, E, Eyepiece: 8, Objective: 100. Photo: as Fig. 1. Photomicrograph of trypan-blue-injected specimen. A and B show the new epidermis growing ‘toward the centre. The pale blue granules under and in front of the new epidermis show the macrophages undergoing changes in the place,

Fixative: Susa. Staining: 0.25°% acid- fuchsin and 1% picric acid. Eyepiece: % 8, Objective: > 10, Photo: as above. "

Magnified photomicrograph of the rectangle in the above figure. A, trypan blue granules -in the macrophages; B, trypan blue granules in the mucleus of the newly formed young cells; C, : newly formed young cell; D, a mass of mixing trypan blue granules and disintegrated leucocytes. Eyepiece: >< 8, Objective: % 100, Photo: as above. :