Page:Passages from the Life of a Philosopher.djvu/362

346 insensible. Those who reside near a waterfall—even Niagara—have their organs soon seasoned and adapted to its monotony. It is the change from quietness to noise, or from one kind of noise to another, which instantly distracts the attention. It would be equally distracted by the reverse—by the sudden change from the hum of the busy world to the stillness of the desert.

The injurious effect of noisy interruptions upon our attention also varies with the nature of the investigations upon which we are engaged. If they are of a kind requiring but a very small amount of intellectual effort, as, for instance, the routine of a public office, they will be little felt. If, on the other hand, those subjects are of such a character as to require the highest efforts of the thinker, then their examination is interrupted by the slightest change in the surrounding circumstances.

When the work to be done is proportioned to the powers of the mind engaged upon it, the painful effect of interruption is felt as deeply by the least intellectual as by the most highly gifted. The condition which determines the maximum of interruption is,—that the mind disturbed, however moderate its powers, shall be working up to its full stretch.

Finding, many years ago, the increasing interruption of my pursuits from street music, as it is now tolerated, I determined to endeavour to get rid of it by putting in force our imperfect law, as far it goes. I soon found how very imperfect it is.

The first step is to require the performer to desist, and to assign illness or other sufficient reason for the request. If a female servant is sent on this mission it is quite useless. The organ-player is scarcely ever acquainted with more than four or five words of our language: but these always the most