The chapter discusses various theories and treatments for asthma. It highlights conflicting views on the cause of respiratory symptoms, with some attributing them to bronchial spasm and others to vaso-motor phenomena. Einthoven's experiments show that vagus nerve stimulation causes broncho-constriction, which is relieved by nicotin or atropin. The author suggests that bronchial spasm can lead to acute emphysema, while Grossmann supports Von Basch's theory that pulmonary capillary engorgement obstructs respiration. Paraldehyde has been successfully used to treat spasmodic asthma, providing relief and inducing sleep. Aspidospermine, derived from quebracho aspidosperma, has also shown promise in treating dyspnoea by increasing respiratory movements, slowing the heart, and lowering temperature. Kruse emphasizes the benefits of sea air for asthma, noting significant improvements in patients who lived near the sea. The chapter also touches on serum therapy, highlighting its potential impact on medicine. Arthur Klein discusses the role of blood serum in immunity, distinguishing between congenital and acquired immunity. Buchner questions the chemical constitution of toxins and antitoxines, suggesting they may be bacterial products. André reports on unsuccessful attempts to treat smallpox with horse serum, and Scheideimihlt discusses the use of serum in treating glanders, noting its effectiveness in both curative and protective roles.The chapter discusses various theories and treatments for asthma. It highlights conflicting views on the cause of respiratory symptoms, with some attributing them to bronchial spasm and others to vaso-motor phenomena. Einthoven's experiments show that vagus nerve stimulation causes broncho-constriction, which is relieved by nicotin or atropin. The author suggests that bronchial spasm can lead to acute emphysema, while Grossmann supports Von Basch's theory that pulmonary capillary engorgement obstructs respiration. Paraldehyde has been successfully used to treat spasmodic asthma, providing relief and inducing sleep. Aspidospermine, derived from quebracho aspidosperma, has also shown promise in treating dyspnoea by increasing respiratory movements, slowing the heart, and lowering temperature. Kruse emphasizes the benefits of sea air for asthma, noting significant improvements in patients who lived near the sea. The chapter also touches on serum therapy, highlighting its potential impact on medicine. Arthur Klein discusses the role of blood serum in immunity, distinguishing between congenital and acquired immunity. Buchner questions the chemical constitution of toxins and antitoxines, suggesting they may be bacterial products. André reports on unsuccessful attempts to treat smallpox with horse serum, and Scheideimihlt discusses the use of serum in treating glanders, noting its effectiveness in both curative and protective roles.