...He was likewise a proficient in the Bambarratongue, and promised on that account to be of great utility to mein future... 
Mungo Park 「Travels in the Interior of Africa, Vol. 1 [of 2]」
...In addition to these, I myself have a dog, "Ava," by name a daughter of Lola, who is already proficient in both accomplishments...
Henny Kindermann Agnes Blake 「Lola」
...Under thestimulus of these higher standards the Negro medical profession will becomemore thoroughly equipped and proficient in the years to come...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
...The little boy is not very proficient in the imitation, and sister corrects him time after time...
Edward S. Curtis 「The North American Indian」
...In order to make himself more proficient in calculatingastronomical tables he studied arithmetic and geometry, and learnedmathematics without the aid of a master...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...He became proficient in Italian and Greek, studiedmathematics, and read books on astronomy...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...At an early age he was occupied in observing celestial objects, makingresearches in optics, and acquiring a proficient knowledge of astronomy...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
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