96 BIOLOGICAL PHYSICS 



it must act in a much more intermittent manner, the one 

 (the pineal) only acting when the ventricular space is full 

 and " running over," so to speak, while the other (the 

 pituitary) must always be more or less active. Hence we 

 may assume that it disposes of only the more fluid con- 

 tents of the overflowing space, the more solid gravitating 

 and being swept away into the more dependent gland, 

 and, consequently, we may be prepared to find that any 

 solid materials found in it will represent the crystalline or 



FIG. 26. NERVES OF THE OUTER WALL OF THE NASAL FOSSAE. (From 

 Sappey, after Hirschfeld and Leveilld. ) -|. 



i, network of the branches of the olfactory nerve, descending upon the region of the 

 superior and middle turbinated bones ; 2, external twig of the ethmoidal branch 

 of the nasal nerve ; 3, sphenopalatine ganglion ; 4, ramification of the anterior 

 palatine nerves ; 5, posterior, and 6, middle divisions of the palatine nerves ; 7, 

 branch to the region of the inferior turbinated bone ; 8, branch to the region of 

 the superior and middle turbinated bones ; 9, naso-palatine branch to the septum 

 cut short. 



earthy matter held in solution or suspension by the 

 comparatively clean supernatant fluid passing through it, 

 and this is really what we find, the substances usually 

 observed being crystals or accretions of carbonate of lime 

 and phosphate of magnesia, in, or around, a matrix, or 

 nucleus, of organic material. 



It is, therefore, obvious that the conclusions come to 

 by the earliest observers regarding the structural charac- 

 teristics of these bodies are really true, in the sense 

 that their structures are true glands, and, consequently, 



