54 PHYSIOLOGY AT THE FAEM. 



obtained do not coagulate on the application of heat, so that 

 they cannot be regarded as containing perfect albumen. The 

 substance so obtained has been termed incipient albumen, 

 which may be regarded as identical with what has been 

 named albuminose; that is to say, incipient albumen or al- 

 buminose may be set down as the nearest approach to albumen 

 which the stomach-digestion is capable of producing out of 

 such proximate principles as caseine, fibrine, and albumen 

 proper. It is supposed that the complete conversion of these 

 aliments into albumen takes place subsequently under the in- 

 fluence of the biliary and pancreatic secretions. 



Under the influence, then, of the gastric juice, the caseine of 

 the mare's milk is changed in the stomach of the colt into this 

 incipient albumen or albuminose. In the ordinary language 

 of physiology, it is common to say that the aliment received 

 into the stomach is changed into chyme. It is to be under- 

 stood, then, that chyme is the heterogeneous mass into which 

 the aliment is changed in the stomach, composed of incipient 

 albumen or albuminose, together with such substances as fat 

 and sugar, more or less altered, but which are to be further 

 altered in ulterior processes, and substances which, as incapable 

 of alteration, are finally to be expelled with the excrement. 



The movements of the stomach are subservient to the due 

 application of the gastric juice to the mass of aliment, and 

 finally to the propulsion of the chyme from the right side of 

 the organ into the duodenum or highest part of the small in- 

 testines. The gastric juice, being derived from the inner sur- 

 face of the stomach, is necessarily applied first and principally 

 to the exterior part of the mass, chiefly in the left or great ex- 

 tremity of the stomach. As the exterior parts of the mass at 

 the left side, by the influence of this secretion, are changed 

 more or less perfectly into chyme, they are moved towards the 

 right extremity by a kind of vermicular movement of the mus- 



