404 BIOLOGY. 



excretory orifices are in a certain sense larynges or tra- 

 cheal orifices. Thus, this relation between secretion and 

 excretion would have been discovered without recourse to 

 conjecture being had upon our part. 



2360. The urine is "par excellence" a double product 

 of this kind. It is secreted in the kidneys for simply 

 one object, like the bile. It is excreted, because it 

 belongs to the sexual system, which is essentially exse- 

 cernent. 



2361. The object or purpose of the urine has not been 

 subverted in all animals. In Birds, where the urinary 

 bladder and intestine are confluent, the urine enters like 

 the bile into the intestine, at least at a spot where there 

 is intestinal matter, which it renders fluid. 



2362. In Insects and Snails it appears to invest as a 

 mucus the ova, and serve for their attachment. The 

 same appears to hold good of the spider's web. What 

 has been called purple juice and ink (in the Cephalopods) 

 ranks probably in the signification of urine. 



c. SEXUAL INTESTINE. 



2363. The sexual intestine is the colon or large intes- 

 tine, which, in this respect, belongs to the sexual system, 

 as has been indicated at 2171. 



II. minimal Sexual Organs. 



2364. The bones of the sex are the feet with their 

 appurtenances, such as the pelvis with the lumbar, sacral 

 and coccygeal vertebrae. The muscles, as well as the 

 nerves, are self-understood. But of these we will speak 

 in the sequel. 



B. ANIMAL ORGANS. 



2365. All organs, which are purely animal, are pene- 

 trated or traversed by the nervous system, just as the 

 lower systems are by the tegumentary formation. No 

 higher organ is the wholly pure evolution of one system, 

 but the systems ever combine with each other ; and this 

 combination, when individually represented, constitutes 

 the organ. 



