2336. The embryonic sexual system is the allantois. The above propositions can only be perfectly developed in the physiology.
b. VASCULAR ORGANS OF THE SEX.
2337. The hæmatopoietic or blood-preparing vascular system is the lung; the blood-destroying, exsecernent vascular system is the kidneys. The kidneys are the lung reversed. The liver decomposes the venous, the kidneys the arteriose blood.
2338. The kidneys are the individualized vascular system of the sex, as the liver is that for digestion. They accord with the liver in their glandular structure, in the renal pelvis, which is like the gall-cyst, in the ureters that resemble the biliary ducts, and lastly, in the general signification of the urine as a product, wherein the whole organism, the whole blood-system has been excreted, like the bile, in which the venous blood undergoes the same process.
2339. Every disturbance of the digestive function acts in a striking and very direct manner upon the urine. The jaundice is apparent in urine; and what else is diabetes than a malady analogous to diseases of the liver? In urine we recognize what the bile has done with the food; the urine is the fluid nutritive system, and consequently the fluid organism "in toto;" the sexual blood, or sexual bile.
2340. The urine is the purest mirror or reflex of the bodily condition, and hence ourology or the doctrine of urine is of the most universal importance in semeiotics or symptomatic pathology: the ureters correspond to the tracheal branches or bronchi; thus, the urinary cyst to the trachea; the urethra to the larynx.
2341. In many animals the ureters open directly into the cloaca, as in many Fishes, Reptiles.
2342. By degrees the cloaca is retracted towards the ureters, and then originates a cloaca, which is both urethra and urinary cyst, as in Birds.
2343. In the higher animals, where a perfect ourocyst or urinary cyst has been evolved, the urethra opens into the anterior wall of the vagina, in front of which the urinary cyst then lies, in a similar manner to the trachea in front of the pharynx.
2344. In many Fishes the urinary cyst is absent, their pulmonic sac being also but feebly developed and only remaining as an asymmetrical swimming-cyst—the ureters too open directly into the cloaca, just as the swimming-cyst opens into the pharynx. The pharynx of Fishes, as being surrounded by the branchial arches, is at once pharynx and larynx, like as in many animals cloaca and urinary cyst are of one and the same kind.