The chief external peculiarity in this creature is the mouth, which, instead of being formed with jaws like those of other fishes, resembles none of them, not even those of the eel, which it most resembles externally. Indeed, on looking at the mouth of a lampern, one is forcibly reminded of the leech, for it is possessed of no jaws, and adheres firmly to the skin by exhaustion of the air.
Very delicate food are these lamperns, quite as good as the lampreys themselves, whose excellence is reported to have cost England one of her kings; yet I never knew but one person who would eat them, and very few who would even touch them, they also being called poisonous.
In Germany they know better, and not only eat the lamperns themselves, but, packing them up in company with vinegar, bay leaves, and spices, export them as an article of sale.
The solitary sensible individual of whom I have made mention was truly a wise man. He used to offer the young urchins of the neighbourhood a reward for bringing lamperns, at the rate of a halfpenny per wisketful.
A wisket, I may observe, is a kind of shallow basket, made of very broad strips of willow; and a wisket filled with lamperns would be a tolerable load for a boy.
So, for the sum of one halfpenny, that philosopher was furnished with provisions for a day or more.
Really, the prejudice against the lampern is most singular. Even near London, when lamperns lived in vast numbers in the Thames, they were only used as bait, being sold for that purpose to the Dutch fishermen. In one season, four hundred thousand of these creatures have been sold merely for bait for cod-fish and turbot.
The scientific name for the lampreys is “Petromyzon,” a word signifying “stone-sucker”. The name is rightly applied; for when the lampern wishes to remain still in one place, it applies its mouth to a stone, sticks tightly to it by suction, and there remains firmly at anchor, and defying the power of the stream. In favourable spots, thousands of these fish may be seen together, quite blackening the bottom of the stream with their numbers. They seem specially to affect shallow mountain streams; and, in spite of the rapid current, wriggle their devious way up the stream with great rapidity. When they are not quite pleased with the spot on which they settle down for the time, they scoop it out to their minds in a very short time. This task is accomplished by means of the sucker-like mouth. If a stone is placed in a position that incommodes them, they affix their mouths to it, and drag it away down the stream. In this way they will remove stones which are apparently beyond the power of so small a creature. By perseverance they thus scoop out small hollows, about eighteen inches long and a foot wide, in which they lie in groups so thick that I have more than once mistaken them for dark logs lying in the stream, and was only undeceived by the waving of the multitudinous tails. Year after year the lamperns followed the same course, and chose the same positions, so that we could at any time tell where these creatures would be found by the thousand, where they would be found singly, and where none would be seen at all.