THE ORGANS OF SENSE 401 



lymph, we have had to mention, or describe, in more or 

 less full detail, excretion from the glandular organs, the 

 pituitary and pineal, of the third ventricle, which may be 

 looked upon as the great excretory mechanism of the 

 central brain structures, and, consequently, the most 

 elaborate and intrinsically perfect system of vital residuum 

 disposal to be discovered in a survey of the whole system ; 

 excretion from the spinal inter-meningeal spaces through 

 their continuation along the filum terminale, the coccygeal 

 gland, bladder or lymph heart, and an outflow series of 

 channels, or ducts, terminating in, and around, the anal 

 orifice of the alimentary canal, where they have been pro- 

 vided in the metamorphic materials laid down on the 

 differentiation of the neurenteric canal ; excretion by the 

 skin through its sweat glands truly a vast excretory 

 area excretion by, and through, the optic apparatuses, 

 excretion by, and through, the auditory organisms via the 

 Eustachian tubes, and into the spinal intra-dural matrix by 

 the ductus ; excretion through the pneumogastrics into all 

 the viscera, with which they are in textural, or histological, 

 relationship, and excretion by all the fibres of communica- 

 tion distributed to the sympathetic nervous system, with 

 secondary excretion therefrom into the parenchyma of 

 organs, into the great serous cavities, through the mucous 

 surfaces, and into the recesses of the cellular, and connec- 

 tive tissues, as well as excretion by the motor nervature 

 into the muscular tissues, tendons, periosteal textures, joint 

 cavities, and bones, their central marrow, and the vascular 

 textures developed therein, by which final neuro-systemic 

 excretion is effected through neuro-systemic excretory 

 agencies. 



2 c 



