Describing Gradus' looks, Kinbote (in VN's novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) mentions the bleak oblong of Gradus' face and his somewhat mesmeric organs of vision:
Gradus is now much nearer to us in space and time than he was in the preceding cantos. He has short upright black hair. We can fill in the bleak oblong of his face with most of its elements such as thick eyebrows and a wart on the chin. He has a ruddy but unhealthy complexion. We see, fairly in focus, the structure of his somewhat mesmeric organs of vision. We see his melancholy nose with its crooked ridge and grooved tip. We see the mineral blue of his jaw and the gravelly pointille of his suppressed mustache. (note to Line 949)
The Oblong Box (1844) and The Mesmeric Revelation (1844) are short stories by E. A. Poe. In the former story Poe mentions a copy of Leonardo's Last Supper:
The box in question was, as I say, oblong. It was about six feet in length by two and a half in breadth; — I observed it attentively, and like to be precise. Now this shape was peculiar; and no sooner had I seen it, than I took credit to myself for the accuracy of my guessing. I had reached the conclusion, it will be remembered, that the extra baggage of my friend, the artist, would prove to be pictures, or at least a picture; for I knew he had been for several weeks in conference with Nicolino: — and now here was a box which, from its shape, could possibly contain nothing in the world but a copy of Leonardo's “Last Supper;” and a copy of this very “Last Supper,” done by Rubini the Younger, at Florence, I had known, for some time, to be in the possession of Nicolino. This point, therefore, I considered as sufficiently settled. I chuckled excessively when I thought of my acumen. It was the first time I had ever known Wyatt to keep from me any of his artistical secrets; but here he evidently intended to steal a march upon me, and smuggle a fine picture to New York, under my very nose; expecting me to know nothing of the matter. I resolved to quiz him well, now and hereafter.
Rubini the Younger makes one think of Izumrudov (izumrud is Russian for emerald; rubin means ruby), one of the greater Shadows (a regicidal organization) who visits Gradus in Nice and tells him the King's new name and address in America:
On the morning of July 16 (while Shade was working on the 698-746 section of his poem) dull Gradus, dreading another day of enforced inactivity in sardonically, sparkling, stimulatingly noisy Nice, decided that until hunger drove him out he would not budge from a leathern armchair in the simulacrum of a lobby among the brown smells of his dingy hotel. Unhurriedly he went through a heap of old magazines on a nearby table. There he sat, a little monument of taciturnity, sighing, puffing out his cheeks, licking his thumb before turning a page, gaping at the pictures, and moving his lips as he climbed down the columns of printed matter. Having replaced everything in a neat pile, he sank back in his chair closing and opening his gabled hands in various constructions of tedium – when a man who had occupied a seat next to him got up and walked into the outer glare leaving his paper behind. Gradus pulled it into his lap, spread it out – and froze over a strange piece of local news that caught his eye: burglars had broken into Villa Disa and ransacked a bureau, taking from a jewel box a number of valuable old medals.
Here was something to brood upon. Had this vaguely unpleasant incident some bearing on his quest? Should he do something about it? Cable headquarters? Hard to word succinctly a simple fact without having it look like a cryptogram. Airmail a clipping? He was in his room working on the newspaper with a safety razor blade when there was a bright rap-rap at the door. Gradus admitted an unexpected visitor – one of the greater Shadows, whom he had thought to be onhava-onhava ("far, far away"), in wild, misty, almost legendary Zembla! What stunning conjuring tricks our magical mechanical age plays with old mother space and old father time!
He was a merry, perhaps overmerry, fellow, in a green velvet jacket. Nobody liked him, but he certainly had a keen mind. His name, Izumrudov, sounded rather Russian but actually meant "of the Umruds," an Eskimo tribe sometimes seen paddling their umyaks (hide-lined boats) on the emerald waters of our northern shores. Grinning, he said friend Gradus must get together his travel documents, including a health certificate, and take the earliest available jet to New York. Bowing, he congratulataed him on having indicated with such phenomenal acumen the right place and the right way. Yes, after a thorough perlustration of the loot that Andron and Niagarushka had obtained from the Queen's rosewood writing desk (mostly bills, and treasured snapshots, and those silly medals) a letter from the King did turn up giving his address which was of all places – our man, who interrupted the herald of success to say he had never – was bidden not to display so much modesty. A slip of paper was now produced on which Izumrudov, shaking with laughter (death is hilarious), wrote out for Gradus their client's alias, the name of the university where he taught, and that of the town where it was situated. No, the slip was not for keeps. He could keep it only while memorizing it. This brand of paper (used by macaroon makers) was not only digestible but delicious. The gay green vision withdrew – to resume his whoring no doubt. How one hates such men! (note to Line 741)
Describing a conversation at the Faculty Club, Kinbote compares Gerald Emerald (a young instructor at Wordsmith University) to a disciple in Leonardo's Last Supper:
In the meantime, at the other end of the room, young Emerald had been communing with the bookshelves. At this point he returned with the the T-Z volume of an illustrated encyclopedia.
"Well," said he, "here he is, that king. But look, he is young and handsome" ("Oh, that won't do," wailed the German visitor.) "Young, handsome, and wearing a fancy uniform," continued Emerald. "Quite the fancy pansy, in fact."
"And you," I said quietly, "are a foul-minded pup in a cheap green jacket."
"But what have I said?" the young instructor inquired of the company, spreading out his palms like a disciple in Leonardo's Last Supper.
"Now, now," said Shade. "I'm sure, Charles, are young friend never intended to insult your sovereign and namesake."
"He could not, even if he had wished," I observed placidly, turning it all into a joke.
Gerald Emerald extended his hand--which at the moment of writing still remains in that position. (note to Line 894)
Gerald Emerald gives Gradus (Shade's murderer) a lift to Kinbote's rented house in New Wye:
Gradus returned to the Main Desk.
"Too bad," said the girl, "I just saw him leave."
"Bozhe moy, Bozhe moy," muttered Gradus, who sometimes at moments of stress used Russian ejaculations.
"You'll find him in the directory," she said pushing it towards him, and dismissing the sick man's existence to attend to the wants of Mr. Gerald Emerald who was taking out a fat bestseller in a cellophane jacket.
Moaning and shifting from one foot to the other, Gradus started leafing through the college directory but when he found the address, he was faced with the problem of getting there.
"Dulwich Road," he cried to the girl. "Near? Far? Very far, probably?"
"Are you by any chance Professor Pnin's new assistant?" asked Emerald.
"No," said the girl. "This man is looking for Dr. Kinbote, I think. You are looking for Dr. Kinbote, aren't you?"
"Yes, and I can’t any more,” said Gradus.
“I thought so,” said the girl. “Doesn’t he live somewhere near Mr. Shade, Gerry?”
“Oh, definitely,” said Gerry, and turned to the killer: “I can drive you there if you like. It is on my way.”
Did they talk in the car, these two characters, the man in green and the man in brown? Who can say? They did not. After all, the drive took only a few minutes (it took me, at the wheel of my powerful Kramler, four and a half).
“I think I’ll drop you here,” said Mr. Emerald. “It’s that house up there.”
One finds it hard to decide what Gradus alias Grey wanted more at that minute: discharge his gun or rid himself of the inexhaustible lava in his bowels. As he began hurriedly fumbling at the car door, unfastidious Emerald leaned, close to him, across him, almost merging with him, to help him open it—and then, slamming it shut again, whizzed on to some tryst in the valley. My reader will, I hope appreciate all the minute particulars I have taken such trouble to present to him after a long talk I had with the killer; he will appreciate them even more if I tell him that, according to the legend spread later by the police, Jack Grey had been given a lift, all the way from Roanoke, or somewhere, by a lonesome trucker! One can only hope that an impartial search will turn up the trilby forgotten in the Library—or in Mr. Emerald’s car. (note to Line 949)
"All the way from Roanoke" brings to mind Roanoke Island mentioned by E. A. Poe in The Oblong Box:
We suffered much, and made a narrow escape; but fortune befriended us, as well as our mates in the long[[-]]boat. We landed, in fine, more dead than alive, after four days of intense distress, upon the beach opposite Roanoke Island. We remained here a week, were not ill-treated by the wreckers, and at length obtained a passage to New York.
"The trilby forgotten in the Library" makes one think of George du Maurier's novel Trilby (1894). Gerald Emerald is a namesake of Gerald du Maurier (1873-1934), an English actor and manager, the son of George du Maurier (1834-96). The characters in Pale Fire include Odon (pseudonym of Donald O'Donnell), a world-famous actor and Zemblan patriot who helps the King to escape from Zembla.