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Updated: June 22, 2025
It occurs about the roots of trees in the Frankland and Lizard Islands. Helix iuloidea. Tab. 2 fig. 4. a, b, c, d. Testa late et perspective umbilicata, orbicularis, superne depressa seu subconcava, rufo-cornea, regulariter costulata; anfractus 4 1/2 convexiusculi, ultimus tumidus, rotundatus; apertura lunaris; peristoma simplex, acutum. Diam. maj. 4 1/2, min. 4, alt. 3 mill.
When a stick, flat on one side, was similarly placed, the tip of the tendril could not curl beyond the flat surface, but coiled itself into a helix, which, turning to one side, lay flat on the little flat surface of wood. In one instance a portion of tendril three-quarters of an inch in length was thus dragged on to the flat surface by the coiling in of the helix.
A few remarks are necessary on this subject, in order to make the experiences gathered in the course of these investigations perfectly clear. When the coil is set to work, the potential of the sphere is alternated, and the small helix now behaves as though its free end were connected to the other terminal of the induction coil.
With respect to curative power, I have discovered but little perceptible difference, produced by the various degrees of rapidity in the vibrations, effected within the range of this magnet. The force of the current is regulated by means of a tubular magnet, which slides over the helix, and is called the plunger. It is approached under a brass cap at the right-hand end of the machine.
We that is to say my husband and I and the bazaar-master ambled along at a pretty smart pace across the desert in the direction of a fishing village called Asker, on the east coast of the island, near which were said to exist ancient remains; these, of course, turned out to be myths, but the village was all that could be desired in quaintness; the houses were all of bamboo, and the floors strewn over with little white helix shells; in one of them we were regaled with coffee, and found it delicious after our hot ride; then we strolled along the shore and marvelled at the bamboo skiffs, the curiously-fashioned oars and water casks, the stone anchors, and other primitive implements used by this seafaring race.
A differential galvanometer was connected with the other helices in such a manner that when a voltaic current was sent through the middle helix its inductive action on the lateral helices should cause currents in them, having contrary directions in the coils of the galvanometer.
In this I install a few Glow-worms and a provision of Snails of a suitable size, neither too large nor too small, chiefly Helix variabilis. We must be patient and wait. Above all, we must keep an assiduous watch, for the desired events come unexpectedly and do not last long. Here we are at last.
After touching the concave side, the tip becomes sensibly curved in one or two minutes; and subsequently, if the touch has been at all rough, it coils itself into a helix. But the helix will, after a time, straighten itself, and be again ready to act. A loop of thin thread only one-sixteenth of a grain in weight caused a temporary flexure.
When the mother was pregnant her husband had to attend to a sow who could not give birth to her pigs; he bled her freely, cutting a notch out of both ears. His wife insisted on seeing the sow. The helix of each ear of her child at birth was gone, for nearly or quite half an inch, as if cut purposely.
The usual game is a small Snail hardly the size of a cherry, such as, for instance, Helix variabilis, Drap., who, in the hot weather, collects in clusters on the stiff stubble and other long, dry stalks by the road-side and there remains motionless, in profound meditation, throughout the scorching summer days.
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