It is clear that asthma and bronchitis are on the increase, especially in Britain, and there are strong indications that this rise may be linked to atmospheric influences. Jan de Vries has over 30 years' experience of treating these conditions and in this important title in the By Appointment Only series, he sets out his own ideas about respiratory disorders. He shows, for example, how many allergic reactions can result in asthma-related problems, hay-fever being a case in point. Viruses, bacteria, and irritants may result in dry coughs, mucus formation, breathlessness, muscle pain, and even light fever, depression, and sometimes emphysema. Emphysema is known to be incurable, but Jan de Vries shows his treatments can bring welcome relief.