“…Thus in wasting diseases, shock, asthénie states, anaemia and abnormally low blood-pressure, and in those operations which require a quick return of the laryngeal reflex, basal narcotics must be used with caution (Marston, 1942). With the exception of asa narcotics ^Td\àéhyàt y they all lower the blood-pressure, depress the respiratory centre and render the reflexes of the upper respiratory tract less brisk than usual.…”