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to a certain extent create an artificial blindness, 

 and in crowded streets it is desirable that they 

 should ; but except in four-wheeled carriages, de- 

 fective sight is objectionable, even in a draught 

 horse. I only mention the difference to guard 

 against the common error of selling a carriage 

 horse, otherwise valuable, because his sight is 

 injured. 



