It is a singular thing, but I find that a concentrated atmosphere helps a concentration
Owing to the terrible uproar and the necessity for concentration
and activity, Tushin did not experience the slightest unpleasant sense of fear, and the thought that he might be killed or badly wounded never occurred to him.
She worked with the steady concentration
that is produced by the successful effort to think down some unwelcome thought by means of another thought.
It was a time, according to a noticeable article in the "Pioneer," when the crying needs of the country might well counteract a reluctance to public action on the part of men whose minds had from long experience acquired breadth as well as concentration
, decision of judgment as well as tolerance, dispassionateness as well as energy-- in fact, all those qualities which in the melancholy experience of mankind have been the least disposed to share lodgings.
Stripped of a great deal of somewhat obscure metaphysical theory, this distinction reduced itself to the certainly vital one, with which all true criticism more or less directly has to do, between the lower and higher degrees of intensity in the  poet's conception of his subject, and his concentration
of himself upon his work.
Darling,' and it needs both privacy and concentration
Tarzan found difficulty in keeping the minds of his fellows set upon the purpose of their adventure, for the mind of an ape lacks the power of long-sustained concentration
Instantly the king realized the menace to himself and sought to fasten his eyes upon the eyes of Gahan, and in doing so he was forced to relax his concentration
upon the rykor in whose embraces Tara struggled, so that almost immediately the girl found herself able to tear away from the awful, headless thing.
He stopped swaying to and fro and appeared to be startled into an attempt to master his faculties of concentration
A woman, in monkish precepts, had been the embodiment and concentration
of what was dangerous and evil--a focus whence spread all that was to be dreaded and avoided.
He leaned forward in his chair with an expression of extraordinary concentration
upon his clear-cut, hawklike features.
In fact, he would have perceived this sun, as yet in the gaseous state, and composed of moving molecules, revolving round its axis in order to accomplish its work of concentration