He estimated how many species of insects lived on each plant species in England, and then extrapolated that figure across the whole planet. âIf we say 400,000, we shall, perhaps, not be very wide of the truth,â he wrote. Today, scientists know the Westwood figure is far too low.
Symptoms: A chronic dry cough that's worse at night, disturbing sleep, and sometimes with wheezing and shortness of breath. Causes: An irritating night cough is often the first sign of asthma, especially in children, but you can develop it at any age. It's also a sign asthma is worsening or not being well controlled.
A cough is a natural response by the body or the respiratory system of the body to expel the irritant substance that is obstructing the air passage, and interferes in breathing mechanism. While cough is just a symptom the real cause for it is an underlying lung disease, or irritation of the respiratory tract.his helps him in diagnosing the causes for dry cough. Following are most common causes for dry cough. 1  Upper Respiratory Tract Infection: dry hacking cough is common symptom in later stage of common cold. 2  The post nasal drip irritates the larynx which results in dry coughing.