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.
SPASMS OF DRY COUGHING. A painful cough could be caused by bronchitis. A coughing fit starts as a tickle at the back of the throat; in some cases, coughing can lead to vomiting. CAUSE: Certain Â­medications can cause coughing, particularly ACE inhibitors, prescribed for high blood pressure, explains Professor Barnes.