The normal mucosa of the nasal tract is light grayish-red. Note character of contents of the cavities (mucus, blood, pus, dry clots or scabs), congestion, hemorrhage, erosions, ulcerations, diphtheritic membrane, diffuse or localized thickenings of the mucosa (polypi), adenoids, exostoses, caries, foreign bodies, parasites (maggots) and neoplasms (sarcoma, fibroma, carcinoma). The most important conditions are acute and chronic catarrhal inflammations, ozæna, croupous or diphtheritic inflammations, syphilis, atrophy or hyperplasia of the mucosa, polypi, and more rarely tuberculosis. Syphilis causes inflammations and gummatous infiltrations of the mucosa, gummatous periostitis, foul-smelling necrosis of the bony portions (ozæna syphilitica). Dense hard fibromata developing from base of skull may fill up the nasopharynx or erode the cranial base and press upon the brain. Softer sarcomatous growths may arise from the hypophysis, or from the lymphoid tissue of the mucosa. Squamous-celled carcinoma is not infrequently primary in the antrum and thence invades the nose. Primary malignant tumors of nasal tract not common. Leprosy, glanders, blastomycosis, and rhinoscleroma are more rarely seen. CHAPTER VII. MAIN INCISION: THORAX AND ABDOMEN. I. METHOD OF OPENING TRUNK. 1. =The Main Incision.= After the examination of the cranium has been completed, the skull-cap is replaced and the anterior flap of the scalp drawn up over it, to hold it in place until the close of the autopsy. The head is then wrapped in a towel to protect the face and hair.