... He workedmuch as a barber does who hones a razor, and with every evidence ofsimilar practice; but his proficiency was the result of years ofpainstaking effort... 
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...MostNatives are born lovers of song and music, and attain easily totechnical proficiency in the art of harmony...
Peter Nielsen 「The Black Man's Place in South Africa」
...I complimented him upon his proficiency in lying, and poor Lángobúmo, almost in tears, confessed that he had pointed out to me the real place...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...One half of his proficiency in the art of Negro breaking, consisted, I should think, in this species of cunning...
Frederick Douglass 「My Bondage and My Freedom」
...If I went into business as I contemplated, I knew it would end my proficiency in the sciences; and yet I felt a desire to accumulate more of the wealth that perisheth...
Austin Steward 「Twenty-Two Years a Slave, and Forty Years a Freeman」
...On ordinary occasions it is not easy to decide on the position anddistance of the bird while uttering its note; for the Corn Crakeis a ventriloquist of no mean proficiency...
Rev. C. A. Johns 「British Birds in their Haunts」
...Skin as before, subsequently removing the leg bones and head,and modelling as in the second system, or working by the firstmethod, according to your degree of proficiency...
Montagu Browne 「Practical Taxidermy」
...Many people attain great proficiency infinding — the Rev...
Montagu Browne 「Practical Taxidermy」
...Men are born with aptitudes for different things,but the art and the science of them all they have tolearn; proficiency comes with practice...
John Burroughs 「Ways of Nature」
...I argued my proficiency so well that he did not refer to the matteragain till Saturday, when he suggested removing one whole cloth fromthe after leech...
Jack London 「Tales of the Fish Patrol」
...Benjamin Banneker's proficiency in mathematicsenabled him to make the first clock manufactured in the United States...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
...This opinion, according to the temper of mindit meets with, almost always produces, either a vain confidence, ora sluggish despair, both equally fatal to all proficiency...
Joshua Reynolds 「Seven Discourses on Art」
...Ireland was not aware that to acquire proficiency in the divine science to which he so pleasantly alludes,requires great application and study...
John Trusler 「The Works of William Hogarth: In a Series of Engravings」
...Professor Russell says that:—“Some admirersof the Chinese cite this eclipse as a proof of theearly proficiency attained by the Chinese in astronomicalcalculations...
George Chambers 「The Story of Eclipses」
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