This he said, because he was not altogether so secure of the fidelity of his new retainer as to lose sight of him at this interesting moment, when rival factions at the court of Elizabeth were running so high.  Wayland Smith willingly acquiesced in the precaution, of which he probably conjectured the motive, but only stipulated that his master should enter the shops of such chemists or apothecaries as he should point out, in walking through Fleet Street, and permit him to make some necessary purchases.  Tressilian agreed, and obeying the signal of his attendant, walked successively into more than four or five shops, where he observed that Wayland purchased in each only one single drug, in various quantities.  The medicines which he first asked for were readily furnished, each in succession, but those which he afterwards required were less easily supplied; and Tressilian observed that Wayland more than once, to the surprise of the shopkeeper, returned the gum or herb that was offered to him, and compelled him to exchange it for the right sort, or else went on to seek it elsewhere.  But one ingredient, in particular, seemed almost impossible to be found.  Some chemists plainly admitted they had never seen it; others denied that such a drug existed, excepting in the imagination of crazy alchemists; and most of them attempted to satisfy their customer, by producing some substitute, which, when rejected by Wayland, as not being what he had asked for, they maintained possessed, in a superior degree, the self-same qualities.  In general they all displayed some curiosity concerning the purpose for which he wanted it.  One old, meagre chemist, to whom the artist put the usual question, in terms which Tressilian neither understood nor could recollect, answered frankly, there was none of that drug in London, unless Yoglan the Jew chanced to have some of it upon hand.

“I thought as much,” said Wayland.  And as soon as they left the shop, he said to Tressilian, “I crave your pardon, sir, but no artist can work without his tools.  I must needs go to this Yoglan’s; and I promise you, that if this detains you longer than your leisure seems to permit, you shall, nevertheless, be well repaid by the use I will make of this rare drug.  Permit me,” he added, “to walk before you, for we are now to quit the broad street and we will make double speed if I lead the way.”

Tressilian acquiesced, and, following the smith down a lane which turned to the left hand towards the river, he found that his guide walked on with great speed, and apparently perfect knowledge of the town, through a labyrinth of by-streets, courts, and blind alleys, until at length Wayland paused in the midst of a very narrow lane, the termination of which showed a peep of the Thames looking misty and muddy, which background was crossed saltierwise, as Mr. Mumblazen might have said, by the masts of two lighters that lay waiting for the tide.  The shop under which he halted had not, as in modern days, a glazed window, but a