98 BIOLOGICAL PHYSICS 



gallery of her latest, best, and finest productions ! These 

 structures, called pituitary and pineal glands respectively, 

 are illustrations of the truth of this exclamation and con- 

 tention, and, it seems to us, that their more exhaustive 

 study will reveal many facts indicating that they are 

 structures of the greatest functional importance in the 

 regulation of the cerebro-spinal lymph circulation, a circu- 

 lation of equal importance with the great blood circulation, 

 and a circulation, in fact, emanating from the blood 

 circulation, and the last of the great series of circulations 



XII 



FIG. 28. NERVES OF THE SEPTUM NASI, SEEN FROM THE RIGHT SIDE. 

 (From Sappey, after Hirschfeld and Leveille.) . 



I, the olfactory bulb; i, the olfactory nerves passing through the foramina of the 

 cribriform plate, and descending to be distributed on the septum ; 2, the internal 

 or septal twig of the nasal branch of the ophthalmic nerve ; 3, naso-palatine 

 nerves. 



involved in the chain of vital processes called by the names 

 deglutition, digestion, absorption, circulation proper, nu- 

 trition, assimilation, secretion, and excretion. Thus, in 

 the earliest stages of embryonic development and the 

 evolution of the nervous system, we observe facilities 

 produced and maintained for the free circulation of intra- 

 and extra-nervine fluids: we perceive, also, that the func- 

 tional role of these fluids is twofold, namely, to be a means 

 whereby the results of nerve structure waste are floated 

 out of the intra- and extra-nervine spaces, and the enclosed 

 structures kept "sweet and clean," in order that their 

 vitally important functions may be performed free from 

 friction and auto-interference, in order that the mental 



