Why had Jim and his cousin failed to reach the Wallingford Lock?

Read this excerpt from Ch.9, it's rather funny:

It was rather late, and we were anxious to get in - at least SHE was anxious to get in. It was half-past six when we reached Benson's lock, and dusk was drawing on, and she began to get excited then. She said she must be in to supper. I said it was a thing I felt I wanted to be in at, too; and I drew out a map I had with me to see exactly how far it was. I saw it was just a mile and a half to the next lock - Wallingford - and five on from there to Cleeve.

"Oh, it's all right!" I said. "We'll be through the next lock before seven, and then there is only one more;" and I settled down and pulled steadily away.

We passed the bridge, and soon after that I asked if she saw the lock. She said no, she did not see any lock; and I said, "Oh!" and pulled on. Another five minutes went by, and then I asked her to look again.

"No," she said; "I can't see any signs of a lock."

"You - you are sure you know a lock, when you do see one?" I asked hesitatingly, not wishing to offend her.

The question did offend her, however, and she suggested that I had better look for myself; so I laid down the sculls, and took a view. The river stretched out straight before us in the twilight for about a mile; not a ghost of a lock was to be seen.

"You don't think we have lost our way, do you?" asked my companion.

I did not see how that was possible; though, as I suggested, we might have somehow got into the weir stream, and be making for the falls.

This idea did not comfort her in the least, and she began to cry. She said we should both be drowned, and that it was a judgment on her for coming out with me.

It seemed an excessive punishment, I thought; but my cousin thought not, and hoped it would all soon be over.

I tried to reassure her, and to make light of the whole affair. I said that the fact evidently was that I was not rowing as fast as I fancied I was, but that we should soon reach the lock now; and I pulled on for another mile.

Then I began to get nervous myself. I looked again at the map. There was Wallingford lock, clearly marked, a mile and a half below Benson's. It was a good, reliable map; and, besides, I recollected the lock myself. I had been through it twice. Where were we? What had happened to us? I began to think it must be all a dream, and that I was really asleep in bed, and should wake up in a minute, and be told it was past ten.

I asked my cousin if she thought it could be a dream, and she replied that she was just about to ask me the same question; and then we both wondered if we were both asleep, and if so, who was the real one that was dreaming, and who was the one that was only a dream; it got quite interesting.

I still went on pulling, however, and still no lock came in sight, and the river grew more and more gloomy and mysterious under the gathering shadows of night, and things seemed to be getting weird and uncanny. I thought of hobgoblins and banshees, and will-o'-the-wisps, and those wicked girls who sit up all night on rocks, and lure people into whirl- pools and things; and I wished I had been a better man, and knew more hymns; and in the middle of these reflections I heard the blessed strains of "He's got `em on," played, badly, on a concertina, and knew that we were saved.

I do not admire the tones of a concertina, as a rule; but, oh! how beautiful the music seemed to us both then - far, far more beautiful than the voice of Orpheus or the lute of Apollo, or anything of that sort could have sounded. Heavenly melody, in our then state of mind, would only have still further harrowed us. A soul-moving harmony, correctly performed, we should have taken as a spirit-warning, and have given up all hope. But about the strains of "He's got `em on," jerked spasmodically, and with involuntary variations, out of a wheezy accordion, there was something singularly human and reassuring.

The sweet sounds drew nearer, and soon the boat from which they were worked lay alongside us.

It contained a party of provincial `Arrys and `Arriets, out for a moonlight sail. (There was not any moon, but that was not their fault.) I never saw more attractive, lovable people in all my life. I hailed them, and asked if they could tell me the way to Wallingford lock; and I explained that I had been looking for it for the last two hours.

"Wallingford lock!" they answered. "Lor' love you, sir, that's been done away with for over a year. There ain't no Wallingford lock now, sir. You're close to Cleeve now. Blow me tight if `ere ain't a gentleman been looking for Wallingford lock, Bill!"