610 GLOSSARY. SYMPATHETIC NERVE SYSTEMIC CIRCULATION. 



into two equal portions : thus the right eye is symmetrical with 

 the left eye, the right ear with the left ear, the right temporal 

 muscle with the left temporal muscle. There are also non-sym- 

 metrical organs : thus the liver and the stomach extend to the 

 right and left of the mesian plane, yet in both organs the part on 

 the right does not correspond in figure to the part on the left. On 

 a more close inspection it is found that the organs concerned in 

 sense and locomotion, or in the functions of relation, are double 

 and symmetrical on each side of the mesian plane, whereas the 

 organs concerned in assimilation, and even those concerned in re- 

 production, are non-symmetrical, notwithstanding that the organs 

 of reproduction are double, arid that even a few of the organs of 

 assimilation, though double, are non-symmetrical. The organs of 

 circulation, of respiration, of digestion, are in the highest degree 

 non-symmetrical on the opposite sides of the body. The left kid- 

 ney is not exactly symmetrical, either in figure or position, with the 

 left ; the testes are not exactly symmetrical, nor are the reproduc- 

 tive organs in the female exactly symmetrical. 



The term symmetry is used also in another signification namely, 

 to denote that kind of appropriate relation in size, figure, and 

 position between the several parts of the external figure which 

 constitute form or beauty in the species, variety, or individual. 

 The appreciation of this quality, or combination of qualities, is of 

 the greatest importance in the choice of the animals that are to be 

 maintained to breed from. For, however inexplicable it may be, 

 it is certain that all the most prized qualities in the horse, the 

 ox, the sheep, the hog, the dog, and even in poultry, are most 

 readily developed by careful feeding and training in those indivi- 

 duals in which such relations of symmetry are conspicuous, even 

 when the parts themselves concerned in the symmetry have no 

 immediate connection with the qualities in question. In the cul- 

 tivation of this symmetry, some points of form, good or bad, often 

 descend, after long interruption, from distant ancestors. No un- 

 symmetrical animal should be allowed, even for once", to take part 

 in the parentage ; and not even a male of undesirable form 

 should be permitted to beget offspring at any time on a female of 

 the race, because it sometimes happens that the influence of such 

 an undesirable sire extends beyond his own immediate progeny to 

 the subsequent offspring of the female. 



SYMPATHETIC NERVE, or the sympathetic system of nerves, also 

 termed the ganglionic system of nerves and the nervous system of 

 organic life. 



SYNOVIAL FLUID or SYNOVIA. The fluid contained in the cavities of 

 the joints and in the bursal cavities. See Bursse Mucosae. 



SYSTEMIC CIRCULATION. The circulation of the blood over the body 

 at large, as distinguished from the circulation through the pul- 



