(1) Of the respiratory system:--Croupose and Broncho-pneumonia of atypical progress (atypical fever of protracted course, relatively strong Dyspnoe, Cyanosis, feeble pulse) and high mortality; after effects serous or mattery Pleuritis, Lung abscesses, Phthisis. (2) Of the circulatory system:--Myocarditis, Endocarditis, Thrombosis. (3) Of the digestive tract:--Chronic stomach and intestinal catarrh, Dyspepsia. (4) Of the nervous system:--Any form of Neuralgia, Paralysis, Neuritis, Psychosis, etc. (5) Of the sense organs:--Otitis media; Nephritis and Muscular Rheumatism are also observed. Influenza aggravates any case of sickness, especially lung trouble." All this seems to constitute a very formidable and perplexing indictment, sparkling with learning and bristling with difficulties. But when these mellifluous mysticisms are once translated into "the vulgar tongue" they prove to be, strange to say, easily within the comprehension of the ordinary layman. For instance, "Apyrexie" means Free from fever; Albuminuria--Albumen present; Miliaria--an acute inflammation of the sweat-glands (Abnormal sweating); Herpes--an inflammatory skin disease characterized by the formation of small vesicles in clusters (Fever rash); Exanthema--Skin eruption; Petechien--Spots; Epistaxis--Nose-bleeding; Hematemesis--vomiting blood; Menorrhagia--Excessive menstruation; Croupose--resembling croup; Broncho-pneumonia--Inflammation of the lungs; Atypical fever--irregular fever; Dyspnoe--Hard breathing; Cyanosis--Blue discoloration of the skin from non-oxidation of the blood; Pleuritis--Pleurisy; Phthisis--consumption; Myocarditis and Endocarditis--Inflammations of the heart; Thrombosis--coagulation of blood; Intestinal Catarrh--Inflammation of the bowels; Dyspepsia--Indigestion; Neuritis--Nerve inflammation; Psychosis--Mental derangement; Otitis media--Inflammation of the ear; and Nephritis--Inflammation of the kidneys. "Aetiology:--The influenza bacillus (found in blood and excrement) is to be regarded as the cause. The malady is highly contagious. Period of incubation given as, from two to seven days. Runs its course in one or two weeks, recovery as a rule favorable; though convalescence is often protracted. Unfavorable results are brought on through complications, most often by Pneumonia. "Diagnosis:--Easily determined during an epidemic or marked symptoms. The catarrhal form of influenza differs from simple catarrh of the mucous membranes of the respiratory tract through the presence of nervous symptoms and a more abrupt beginning. The symptoms may be similar to those of Measles or Abdominal typhus. In each case, complications with Pneumonia must be considered.