═════════════════════════════════════ Acute bronchitis and tracheitis 26 Subacute bronchitis and tracheitis 1 Acute mucopurulent tracheitis 5 Acute purulent bronchitis 2 Acute mucopurulent bronchitis 7 Ulcers of trachea 1 Acute bronchiectasis 1 ───────────────────────────────────── Thus whereas we have indicated that the inflammation of the trachea and of the large bronchi is of a peculiar kind and remains confined to the tissue lying inwardly from the cartilage rings, we found that where these structures give place to a loose muscle tissue with a more extensive lymphatic drainage the zone of inflammation is not so limited, but proceeds outwardly into the neighboring tissues. We often use the terms bronchus and bronchioles very freely without clearly distinguishing any real difference. In a study of the inflammatory reactions of the respiratory tubes in epidemic influenza (as well as in other infections) it is best to accept the anatomical definition that the bronchioles not only represent the minute tubules passing to the alveoli, but also those small air passages which devoid of cartilage, mucous glands and heavy connective tissue stroma are in close relation to the parenchymatous tissues of the lung. These soft muscular tubes possess blood and lymphatic vessels which freely communicate with the blood vessels of the lung alveoli. It is in association with these distant tubes that concomitant inflammatory reactions are found in the alveoli and in the bronchial tubes.