Fracture of inner table without injury to the outer, of rare occurrence. Illustrative cases. Subsequent mischief relieved by operation at the end of two years. Peculiar division and fracture of inner table. Principle in surgery on this point. Illustrative cases. Trephine less dangerous at the first than at a later period. Fragments of bone injuring the brain to be removed; propriety of division of scalp in an adult, to examine the state of the bone beneath. Operation dangerous; illustrative cases. Brain bears pressure best in young persons. Symptoms of concussion are frequently accompanied by those of compression. Contre-coup. pp. 321-340 LECTURE XIX. Immediate and secondary tumors of the scalp. Suppuration on the dura mater; on the brain; elevation or rising up of the dura mater, indicating fluid beneath. Balls penetrating the brain. Sutures separated by musket-balls. Injury of the frontal sinuses; of the orbit and brain. Fungus, or hernia cerebri. Presumed cause of permanent defects. Application of trephine; abuse of. Erysipelas of the scalp. pp. 340-364 LECTURE XX. Wounds of the chest most dangerous. Incised wounds require a treatment essentially distinct from those made by gunshot. Contused wounds. Auscultation of primary importance; distinctive sounds learned from it. Symptoms of inflammation. Serous effusion the most important evil in wounds of the chest. Respiratory murmur; pleuritic effusion. Symptoms of pneumonia. Pulse. Difficulty of breathing; cough; sputum. Differences of delirium. Rhoncus crepitans. Effects of inflammation of the pleura; thickness of pleura in or after chronic inflammation. Changes in the lung, subsequent on pneumonia, are principally three. pp. 364-381 LECTURE XXI. General blood-letting in pleuritis and pneumonia; local bleeding. Internal remedies; tartar emetic; mercury; opium; blisters. Typhoid pneumonia; treatment. Empyema or effusion of fluids into the cavity of the chest; symptoms of. State of lung. Auscultation; operation for empyema; place of election. Admission of air into the chest when in a healthy state harmless; illustrative cases. Pneumothorax, nature of, as ascertained by auscultation. Metallic tinkling; illustrative cases; treatment. Emphysema; nature of; treatment. pp. 382-414 LECTURE XXII. Simple injuries to the chest from sword or knife; involving the lung; wound not to be probed; to be closed by a continuous suture; patient to lie on the wounded side. Treatment of incised wounds of greater extent; not to be examined by the probe or finger; absolute quietude necessary; to relieve the oppression in breathing; to suppress hemorrhage; closure of the wound; secretion of fluid into the cavity; necessity for a depending opening. Illustrative cases. Ecchymosis, pathognomonic of blood effused into the chest. Conclusions, six in number. pp. 414-425 LECTURE XXIII.