Owing to impurities contained in the materials from which glasses are made, accidental coloration or discoloration is often produced.
If he recovers from the depression, the local symptoms begin to play a much more important part than in cobra-poisoning: great swelling and discoloration extending up the limb and trunk, rise of temperature and repeated syncope, and laboured respiration.
Wilting of the foliage followed by the discoloration of the stem and branches is characteristic of a disease of the potato known as "Blackleg."
In from twelve to twenty-four hours these severe constitutional symptoms usually pass off, but in the meantime the swelling and discoloration have spread enormously.
Discoloration of the water is often observed at sea, but that is always due.