ORGANS OF NUTRITION IN SHEEP. 135 



Chyle. Thus there is reason to think that the chyle is 

 poured by the afferent vessels into the cavities of the spongy 

 structure, from which it passes by minute lymphatic branches 

 into the central lymphatic plexus, to be conveyed thence by 

 the efferent vessels, and out of the gland by the hilum. Thus 

 the pulpy matter in the cavities of the spongy structure is 

 chyle, and as the chyle is richer in corpuscles when it issues 

 from a gland than before it enters, fresh corpuscles must be 

 produced in the glandular cavities from the blood-plasma 

 supplied by the numerous capillaries. Thus the new or crude 

 chyle brought from the intestines is mingled with the perfected 

 matter directly derived from the blood, in accordance with 

 what seems a rule in organic life namely, that the material 

 of repair newly derived from aliment is mingled with material 

 forming already a part of the organism before it is ready 

 to become itself assimilated, and taken up as an integral part 

 of the living structure. 



A recapitulation was already given of the process of nutri- 

 tion in the horse in terms so general as to apply almost word 

 for word to that process in the ox. Instead of repeating that 

 statement here, we refer our readers to the passage in question 

 at p. 81. 



OR.GANS OF NUTRITION IN THE SHEEP. 



Mouth and Teeth. The mouth extends from the lips in 

 front to the pharynx or commencement of the alimentary 

 canal behind. Its sides are formed by the cheeks, its base 

 by the tongue, its upper part by the hard palate anteriorly, 

 and posteriorly by the soft palate or veil of the palate. 



Like the horse and ox, the sheep has a set of deciduous 

 or milk teeth. The teeth of the sheep, both deciduous and 



