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Both classes have a complete ciliary coat on the epidermis, a heritage from the Turbellaria and the Gastraeads; also, both have two openings of the gut, the mouth and anus, like the Gastrotricha. But we find also an important organ that is wanting in the preceding forms the vascular system.
These facts and deductions have given rise to the present day circulatory theory of intra-ocular pressure, so we now can approach the predisposing and exciting factors which determine glaucoma. The central fact to be borne in mind is, if the physiological pressure is vascular in origin and nature, the pathological pressure must likewise be derived from the same source.
Finally, at b, we recognize the undoubted traces of a vascular bundle running to the leaves. If the bundle appears to be larger than that of the Sigillariæ, this is due to the flattening that the trunk has undergone, the effect of this having been to spread the bundle out in a vertical plane, although its greatest width in the first place was in a horizontal one.
He considers that there are two kinds of polypi first, the soft, vascular and bleeding polypus, usually produced from the fibro-cartilaginous structure of the outer half of the tube; and, secondly, the hard and cartilaginous polypus or excrescence produced from the lining membrane of its inner half. The first is termed the haematoid polypus, and the other the chondromatous.
These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall the border zone of the germinal disk in which the embryonic vascular net is first developed. The nuclei of the merocytes become ten times as large as the ordinary cell-nucleus, and are distinguished by their strong capacity for taking colour, or their special richness in chromatin.
"First, Coffee produces on the organism two chief effects, which it is very difficult to connect together, namely, the raising the activity of the vascular and nervous systems, and protracting remarkably the decomposition of the tissues.
The cell growth in question is effected in the ovaries; the final stage of the process, the rupture of the containing cell or ovisac, and escape of the ovule, is attended by a concentration of nervous activity in the ganglionic masses sending nerves to those organs analogous to that which occurs in the solar plexus at periods of digestion; the fall of the ovule is itself analogous to the shedding of epithelial cells in the gastric follicles; the afflux of blood to the utero-ovarian veins, analogous to the periodical congestion of the gastro-splenic vascular apparatus.
The white matter of the cerebrum, studded with red points, could scarcely be distinguished, when it was incised, by its natural whiteness; and the pia-mater, or internal vascular membrane covering the brain, resembled a delicate web of coagulated red blood, so tensely were its fine vessels engorged.
Very few races under contract with Hospital Earth ever attempted their own major surgery. If a Moruan surgeon had walked into a tight spot in the operating room, it could be a real test of skill to get him and his patient out of it, even on a relatively simple procedure. But organ-transplantation, with the delicate vascular surgery and micro-surgery that it entailed, was never simple.
One set of nerves causes contraction of the muscular fibers of the uterus, while the other set transmits impulses which bring about its vascular engorgement; and they are probably concerned in bringing about the determination of blood to the uterus and its appendages, which is so marked a feature of the menstrual process.
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