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He found the portion connecting with the cord by the dorsal root to be concerned in the production of feeling and the portion connecting by the ventral root to be concerned in the production of motion. In keeping with these functions, the two divisions of the nerve are made up of different kinds of fibers, as follows: 1.
Beside the perivisceral cavity and its fluid there is a special circulatory system. This consists mainly of one long tube above the intestine and a second below, with often several smaller parallel tubes. Transverse vessels run from these to all parts of the body. The dorsal tube pulsates and thus acts as a heart.
For half a mile beyond the grey Church and Vicarage of Bleakirk it extends, forming the northern arm of the small fishing-bay, and protecting it from the full set of the tides. Towards its end it breaks away sharply, and terminates in a dorsal ridge of slate-coloured rock that runs out for some two hundred feet between the sands we call the Twin Brothers.
On the top of one of the cases the visitor should notice also the remarkable large head, from Mexico, with a long dorsal ray. There are six orders or families of osseous or bony fish; and specimens of all these will be found in the wall cases of this room. First there is the family of This family occupies the first thirteen wall cases.
In the telescope, the "two interlacing arcs of light" which had adorned the head of Coggia's comet were reproduced; while a curious dorsal spine of strong illumination formed the axis of the tail, which extended in clear skies over an arc of 20°. It belonged to the same "type" as Donati's great plume; the particles composing it being driven from the sun by a force twice as powerful as that urging them towards it.
Spermaceti exists in all the oil, especially that from the dorsal hump; but it is left for the refiners ashore to extract and leave the oil quite free from any admixture of the wax-like substance, which causes it to become solid at temperatures considerably above the freezing-point.
"A, ileo-colic artery; B and F, posterior cecal artery; C, appendicular artery; E, appendicular artery for free end; H, artery for basal end of appendix; 1, ascending or right colon; 2, external sacculus of the cecum; 3, appendix; 6, ileum; D, arteries on the dorsal surface of the ileum." Byron Robinson. The reader will see how very much like a blind pouch the cecum is, 2.
When it comes to the surface to breathe, it rises horizontally, showing first its back fin, then draws an inspiration, and dives gently down, head foremost. When this rises the top of the head is the part first seen; it then blows, and immediately afterwards dips head downwards, its back curving over, exposing successively the whole dorsal ridge with its fin.
The most esteemed part of the animal is the hump, called by the Canadians bos, by the Hudson's Bay people the wig; it is merely a strong muscle, on which nature at certain seasons forms a considerable quantity of fat. It is attached to the long spinous processes of the first dorsal vertebræ, and seems to be destined to support the enormous head of the animal.
The rays of the dorsal and pectoral fins are so elongated, that when specimens were first brought to Europe it was conjectured that these fishes have the faculty of flight, and hence the specific name of "volitans" But this is an error, for, owing to the deep incisions between the pectoral rays, the pteroids are wholly unable to sustain themselves in the air.