Another experiment demonstrated that physical exercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning.
If filings of iron, sulphur and water be mixed together, these bodies thus capacitated to act on each other, are heated by degrees, and ultimately produce a violent combustion.
An acute whole-cranial, severe headache associated with fever, photophobia, and stiff neck indicates an infectious process, such as meningitis, until proved otherwise.