Explain these lines -

‘Within a week it sickened to a raging fever and its pulse went up to a hundred and fifty in the shade.’

The author possessed a watch that ran down after it worked properly for eighteen months and he took the watch to the chief jeweler to get it repaired and set it to the right time, as it had become slow and was behind the time. The head of the establishment ignored the author when he told him to leave his watch alone. After that incident, the watch became faster than it should be and the author used symbolism when he says that the watch 'sickened to raging fever and its pulse went up to a hundred and fifty in the shade'.