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Updated: June 22, 2025
An unattached tendril rolls itself up into a flat helix, as in the case of Cardiospermum, if the contraction commences at the extremity and is quite regular; but if the continued growth of the outer surface is a little lateral, or if the process begins near the base, the terminal portion cannot be rolled up within the basal portion, and the tendril then forms a more or less open spire.
In the suburbs of the village I found a fair number of bees and wasps, and some small but interesting beetles. Two or three new birds were obtained by my hunters, and by incessant inquiries and promises I succeeded in getting the natives to bring me some land shells, among which was a very fine and handsome one, Helix pyrostoma.
The specimen of the species of Helix I have above mentioned was found by Mr. Dring, one of our most successful collectors in that department. Leaving Depuch Island, we examined the coast to the eastward as far as the Turtle Isles, a distance of eighty-five miles, the first twenty-seven of which trended North 55 degrees East, and the remainder North 67 degrees East curving slightly inwards.
It is a sort of sea-snail, as the name helix implies, is perfectly smooth, "very delicate and fragile, and not more than about three-quarters of an inch in diameter." All these shell-fish contain a sac or bag full of colouring matter, which is capable of being used as a dye.
The front end of the helix acts, in fact, like the north pole of a magnet, and the further end like the south pole. If a small bar of iron be now pushed into the interior of this helix, the lines of force will run through it and magnetize it, converting it into an electro-magnet.
St. Helena, situated so remote from any continent, in the midst of a great ocean, and possessing a unique Flora, excites our curiosity. The eight land-shells, though now extinct, and one living Succinea, are peculiar species found nowhere else. Mr. Cuming, however, informs me that an English Helix is common here, its eggs no doubt having been imported in some of the many introduced plants. Mr.
Diam. maj. 23, min. 20, alt. 11, mill. A Helix of the Caracolla section, allied to the C. panayensis of Broderip. Found on the ground at the roots of trees, in the South-East Island of the Louisiade Archipelago. Helix louisiadensis. Tab. i. fig. 8. a, b.
This tendency of particular localities to re-produce certain specialities of form and colour is not confined to the sea or to the instance of the chank shell. In the gardens which line the suburbs of Galle in the direction of Matura the stems of the coco-nut and jak trees are profusely covered with the shells of the beautiful striped Helix hamastoma.
He then passed from magnets to currents, enclosing bars of heavy glass, and tubes containing liquids and aqueous solutions within an electro-magnetic helix. A current sent through the helix caused the plane of polarization to rotate, and always in the direction of the current. The rotation was reversed when the current was reversed.
I have seen nests where this Helix took the place of pebbles almost entirely. They were like boxes made of shells, the work of a patient hand. A comparison offers here.
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