To illustrate reflex action by what is called knee-jerk.

The presence or absence of the knee-jerk may be a most significant symptom to the physician.

No son of Paian he, but a fatherless, full-grown birth from the incessant matrix of Modern Time, so motherly of monstrous litters of "Gorgon and Hydra and Chimaeras dire"; you will understand what I mean when you consider the quite recent date of, say, the introduction of anaesthetics or antiseptics, the discovery of the knee-jerk, bacteriology, or even of such a doctrine as the circulation of the blood.

Billing themselves as the next phase in a truly populist and articulated body politic, the sites amount to little more than an opportunity for politicians to glean the gist of a few more uninformed, knee-jerk reactions to the issue of the day.

This state was accompanied by an intense contraction of the pupils, absence of the knee-jerk, considerable rigor, and a rapt and arrant expression.