...They cannot concentrate longenough upon a single idea... 
Edgar Rice Burroughs 「Tarzan the Untamed」
...With one child or one accomplishmentit’s different; you simplyhave to concentrate your admiration onthat...
Various 「Ainslee's magazine, Volume 16, No. 2, September, 1905」
...These wintering crows concentrate in the western partof the study area where the flat, fertile wheat fields of central HarveyCounty are replaced by sand dunes and the sandy Arkansas River Valley...
Dwight Platt 「Food of the Crow, Corvus brachyrhynchos Brehm, in South-central Kansas」
...Sei whales usually travel in groups of from two to fiveindividuals, though they may concentrate in large numberson the feeding grounds...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...In the spring and summer they concentrate near thenorthern limits of their range, occasionally visiting deepchannels of the Gulf of St...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...If we turn from Australian to Indian snakes, the peculiar tendency ofthe poison to concentrate its action on special nerve-centres becomesstill more marked...
A. Mueller 「On Snake-Poison: its Action and its Antidote」
...Terrapene ornata seems to concentrate its breeding season(laying, incubation, and hatching of eggs) more nearly in themiddle of the warm season than does T...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...An exceedingly good shepherd's dog appears to concentrate all his powersin his own immediate vocation; and in this does he exert and exhaust hiswhole capacity...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...The policy of the Indian Office from the beginning had been to concentrate the various bands upon one reservation at San Carlos...
Edward S. Curtis 「The North American Indian」
...My oldproblems—I can concentrate on them...
Various 「Astounding Stories of Super-Science, December 1930」
...If wenow pass this beam of light through alens in order to concentrate the beam,both the pipe of heat and the cold corewill focus...
Various 「Astounding Stories of Super-Science, March 1930」
...Wilcox, of course, neverexplains an order, but the reason for having only one operator on thejob is simply to concentrate responsibility on that one man...
Roman Frederick Starzl 「The Martian Cabal」
...We would simply enforce our authority until we located definiteresistance; we would then concentrate our efforts upon isolating thesource of this resistance and overcoming it...
Sewell Peaslee Wright 「Priestess of the Flame」
...We shall, however, findit desirable to narrow the question still more, and concentrate ourattention on one splendid illustration...
Robert Stawell Ball 「The Story of the Heavens」
...Let us concentrate ourattention specially upon that line of the solar spectrum marked ...
Robert Stawell Ball 「The Story of the Heavens」
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