In these excursions Peter was sometimes dressed in the English citizen's dress, and sometimes he wore the dress of a common sailor. In the latter costume he found that he could walk about more freely on the wharves and along the docks without attracting observation, but, notwithstanding all that he could do to disguise himself, he was often discovered. Some person, perhaps, who had seen him and his friends in the ship-yard, would recognize him and point him out. Then it would be whispered from one to another among the by-standers that that was the Russian Emperor, and people would follow him where he went, or gather around him where he was standing. In such cases as this, as soon as Peter found that he was recognized, and was beginning to attract attention, he always went immediately away. Among other objects of interest which attracted Peter's attention in London was the Tower, where there was kept then, as now, an immense collection of arms of all kinds. This collection consists not only of a vast store of the weapons in use at the present day, laid up there to be ready for service whenever they may be required, but also a great number and variety of specimens of those which were employed in former ages, but are now superseded by new inventions. Peter, as might naturally have been expected, took a great deal of interest in examining these collections. In respect to all the more ordinary objects of interest for strangers in London, the shops, the theatres, the parks, the gay parties given by the nobility at the West End, and other such spectacles, Peter saw them all, but he paid very little attention to them. His thoughts were almost entirely engrossed by subjects connected with his navy. He found, as he had expected from what he heard in Holland, that the English ship-carpenters had reduced their business quite to a system, being accustomed to determine the proportions of the model by fixed principles, and to work, in the construction of the ship, from drafts made by rule. When he was in the ship-yard he studied this subject very attentively; and although it was, of course, impossible that in so short a time he should make himself fully master of it, he was still able to obtain such a general insight into the nature of the method as would very much assist him in making arrangements for introducing it into his own country. There was another measure which he took that was even more important still. He availed himself of every opportunity which was afforded him, while engaged in the ship-yards and docks, to become acquainted with the workmen, especially the head workmen of the yards, and he engaged a number of them to go to Russia, and enter into his service there in the work of building his navy.