These puzzlesome problems have led some philosophers to the idealist conclusion, namely, the view that there are no objects apart from their percepts, hence percepts do not resemble anything other than perhaps each other.

What is the secret mesmerism which friendship possesses, and under the operation of which a person ordinarily sluggish, or cold, or timid, becomes wise, active, and resolute, in another's behalf?

A hacking cough is most commonly observed in chronic catarrh of the upper air-passages, in pharyngitis and laryngitis, and especially in beginning pulmonary tuberculosis; hence its importance.

Physical constraints of the human body are easy to see: there are no linguo-nasal trills, for example.