The great central depression of the continent which reaches from the foot of the Pamir plateau on the west through the Tarim desert to Lop Nor and the Gobi has yielded up many interesting Chinese secrets.
To this lofty quality of intellect he added a rare sagacity in perceiving analogies, and in detecting the new truths that lay concealed in his formulae, and a tenacity of mental grip, by which problems, once seized, were held fast, year after year, until they yielded up their solutions.
This had been strengthened by the hattisherif of 1802; while the treaties of 1812, 1826 and 1829 had respectively yielded up Bessarabia, the Sulina mouth of the Danube and the St George mouth to the tsar.
They have yielded up all Europe to him, and have now come to teach us.
