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Presently the tube bends into the shape of an S, and turns spirally on an imaginary axis in such a way that the hind part comes to lie on the dorsal surface of the fore part. The united vitelline veins open into the posterior end. From the anterior end spring the aortic arches.
Again, the tendrils of some few plants never contract spirally unless they have first seized hold of some object; if they catch nothing they hang down, remaining straight, until they wither and drop off: this is the case with the tendrils of Bignonia, which consist of modified leaves, and with those of three genera of the Vitaceae, which are modified flower-peduncles.
All the authors, except Palm and Mohl, who have discussed the spiral twining of plants, maintain that such plants have a natural tendency to grow spirally. Even before reading Mohl's interesting treatise, this view seemed to me so probable that I tested it in every way that I could, but always with a negative result.
How do you explain the origin of those leaves on the stem which, not arising from distinct geniculi, are placed spirally or scattered around the stem? In what succession does the development of the organs of the flower take place? and their formation in the bud? What are the leaves of the Spergula? What are the tufted leaves of various pine-trees? What is individuality in plants?"
He writhed spirally but slowly up its rough trunk, which seemed from eighteen to twenty inches in circumference. When the rocks ceased flying he would halt, evidently not half-liking his task, to wave his bluntly triangular head in the direction where the moving shadow indicated to his blurred vision the position of his enemy.
So down again from this sun of Spain to woody coverts where the wild hops are blocking every avenue, and green-flowered bryony would fain climb to the trees; where grey-flecked ivy winds spirally about the red rugged bark of pines, where burdocks fight for the footpath, and teazle-heads look over the low hedges.
Whence they come none can tell, and the only probable suggestion is that they hover at a height beyond the ken of human eye over a passing caravan, for they are first noticed as specks in the air above, moving slowly round in circles as they descend spirally upon their prey. These birds are most voracious, gorging themselves with as much as they can possibly contrive to swallow.
There's a glimpse over the lake that smokes of a corner of Killarney; tempts the eye to dream, I mean." De Craye wound his finger spirally upward, like a smoke-wreath. "Are you for Irish scenery?" "Irish, English, Scottish." "All's one so long as it's beautiful: yes, you speak for me. Cosmopolitanism of races is a different affair.
In Arctic North America the Indians catch the Varying Hare by walking spirally round and round it, when on its form: the middle of the day is reckoned the best time, when the sun is high, and the shadow of the hunter not very long. On our return to Maldonado, we followed rather a different line of road.
They would go up the trees with great ease, and glide serpent-like out upon the main branches. When they descended the tree, they were unable to come straight down, like a squirrel, but went around it spirally.
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