The uterine cavity is normally empty; during menstruation or as the result of inflammation it may contain blood and bloody mucus; and the mucosa may be deep-red. The normal mucosa is gray-red and 0.5-1.0 mm. thick. In the puerperal uterus portions of the placenta, fœtal membrane, purulent or bloody lochial discharges are present. The placental site is shown by its uneven surface and presence of blood-clots. Gangrenous and purulent areas are greenish, gray, brownish-green, and black, with opaque and ragged surface. Gas-bubbles may be present. The normal consistence of the uterus is firm, diminished in the puerperal uterus, increased in chronic metritis. The cut-surface is smooth in the virgin uterus, rough in the uteri of women who have borne children and in chronic metritis. The most common pathologic conditions of the uterus are: abortion, hæmorrhage, apoplexia uteri, hæmatometra, hydrometra, pyometra, rupture, perforation, traumatic lesions, endometritis (acute, chronic, hæmorrhagic, interstitialis, glandularis, hyperplastica, cystica, polyposa, adenomatosa, infective, decidual, atrophic, etc.), foreign bodies, tuberculosis, syphilis, actinomycosis, hyperplasia, metritis (acute, chronic, hyperplastic, atrophic), perimetritis, parametritis, atrophy, neoplasms (myoma and myofibroma the most common; adenoma, adenomyoma, adenomatous polypi are very common; carcinoma [adenocarcinoma, cystocarcinoma, medullary, papillary, colloid, scirrhous, squamous-celled, malignant chorio-epithelioma] very common; sarcoma less common but it is not rare [myosarcoma the most common form; often represents a sarcomatous transformation of a myofibroma]; metastatic carcinoma and sarcoma are rare), and parasites (echinococcus). 7. =Tubes.= Note _length_, _thickness_, _shape_, _character of peritoneum_, _patency_, _fimbriated extremities_ (swelling, redness, exudate, tubercles, hæmorrhage), _contents_, _color_ and _thickness of mucous membrane_, _thickness_ and _consistence of entire wall_. Tubes should be straight, not tortuous; in inflammation they are usually twisted, tortuous or bent. Hæmatosalpinx is usually caused by a tubal gestation. The most common pathologic conditions are: salpingitis (usually gonorrhœal, acute, chronic, catarrhal, purulent, pyosalpinx, hydrosalpinx, interstitial, perisalpingitis, tubo-ovarian abscesses and cysts), tuberculosis, actinomycosis (rare), syphilis (very rare), hæmatoma (ectopic gestation relatively frequent), neoplasms (rare: adenomyoma, fibromyoma, fibroma, myosarcoma, sarcoma, carcinoma, chorio-epithelioma and teratoma; secondary carcinoma from uterus, ovary and intestine).