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.
While this type of breathing pattern generally isn't harmful in short durations it can cause the throat to become dry and raw if stress and/or anxiety are sustained. Once the throat becomes dry and raw, it can cause a persistent tickling sensation that can cause a persistent dry cough. Moreover, persistent coughing can also irritate the throat, which can cause a persistent cycle of dry throat, coughing, irritated and dry throat, coughing, and so on.