THE DIGESTIVE ORGANS. 49 



doing its duty the blood, instead of being deprived of its carbon, 

 retains it, continuing blue even in the arteries, and giving that 

 colour to the lips and mouth. To such an extent is this failure 

 sometimes carried, that the death of the animal ensues from 

 the circulation of carbon to a poisonous excess in the brain. 



Such, then, are all the processes carried on in the body, with 

 the exception of the special organs of sight, hearing, smell, and 

 touch, and also of those organs which supply the materials for the 

 wear and tear of the various parts of the individual, and of the 

 organs which are intended to carry on the species by the reproduc- 

 tion of others similar in their characteristics to the parent stem. 



It is right, however, to remark, that there are other organs 

 which assist the kings in purifying the blood, which, in fact, carry 

 off some of the carbon mixed with refuse matters in an unfit state 

 for so delicate a texture as that of the lungs. These organs may 

 be said to remove the smoke and cinders of the stove in the shape 

 of fasces and urine, but, as they are intimately mixed up with 

 them, I shall reserve their examination till we enter upon 



THE DIGESTIVE ORGANS. These organs consist of two separate 

 and distinct sets, the first being one continuous alimentary canal, 

 enlarged and contracted at intervals, which commences at the 

 mouth and terminates at the anus ; whilst the second comprises 

 the assistant solid viscera, intended to serve various purposes, as 

 the salivary glands, the liver, spleen, and pancreas, the small 

 glands distributed along the intestines, and lastly the kidneys. In 

 this short and hurried account of these important organs, which 

 are the seat of most of the diseases to which the dog is subject, it 



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