He remained at Amsterdam, constantly employed in his usual occupations of shipbuilding, engineering, geography, and the practice of natural philosophy, till the middle of January 1698, and then he set out for England, but still as one of the retinue of his ambassadors. King William sent his own yacht to meet him, and two ships of war as convoy. In England he observed the same manner of living as at Amsterdam and Saardam; he took an apartment near the king's dockyard, at Deptford, where he applied himself wholly to gain instruction. The Dutch builders had only taught him their method, and the practical part of shipbuilding. In England he found the art better explained; for there they work according to mathematical proportion. He soon made himself so perfect in this science, that he was able to give lessons to others. He began to build a ship according to the English method of construction, and it proved a prime sailor. The art of watchmaking, which was already brought to perfection in London, next attracted his attention, and he made himself complete master of the whole theory. Captain Perry, the engineer, who followed him from London to Russia, says, that from the casting of cannon, to the spinning of ropes, there was not any one branch of trade belonging to a ship that he did not minutely observe, and even put his hand to, as often as he came into the places where those trades were carried on. In order to cultivate his friendship, he was allowed to engage several English artificers into his service, as he had done in Holland; but, over and above artificers, he engaged likewise some mathematicians, which he would not so easily have found in Amsterdam. Ferguson, a Scotchman, an excellent geometrician, entered into his service, and was the first person who brought arithmetic into use in the exchequer in Russia, where before that time, they made use only of the Tartarian method of reckoning, with balls strung upon a wire; a method which supplied the place of writing, but was very perplexing and imperfect, because, after the calculation, there was no method of proving it, in order to discover any error. The Indian ciphers, which are now in use, were not introduced among us till the ninth century, by Arabs; and they did not make their way into the Russian empire till one thousand years afterwards. Such has been the fate of the arts, to make their progress slowly round the globe. He took with him two young students from a mathematical school,[46] and this was the beginning of the marine academy, founded afterwards by Peter the Great. He observed and calculated eclipses with Ferguson. Perry, the engineer, though greatly discontented at not being sufficiently rewarded, acknowledges, that Peter made himself a proficient in astronomy; that he perfectly well understood the motions of the heavenly bodies, as well as the laws of gravitation, by which they are directed. This force, now so evidently