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A MANUAL OF VETERINARY PHYSIOLOGY 



in the horse have not been ascertained. In the following table those 

 for man are given from the calculation made by the Rev. Professor 

 Haughton. They are probably near enough for our purpose, which 

 is to illustrate the fact that the body weight of an animal forms 

 no inconsiderable part of its load, and that the effort to move it 

 increases with the velocity : 



It is a very difficult matter to obtain exact information regarding 

 the work performed by horses. Fortunately, a good deal of precise 

 information was collected many years ago in connection with the 

 wear and tear of animals, at a time when road-building in this country 

 was being scientifically studied, and still later when the running of 

 coaches had, in consequence of the improvements in the roads and 

 the general improvement in the care and management of horses, 

 become an art of national importance. Information was thus 

 obtained of the force of traction over different gradients, and the 

 amount of work expected from the horses. The following table is 

 by Stewart ;* it shows the daily distance travelled, the velocities, 

 the weight of the load, and number of working hours : 



Carriers (Two Wheels). 



In the last observation it will be observed that the increase in pace, 

 in distance travelled, and in load, lead to a reduction in the number 

 of working days. 



Waggons (Four Wheels). 



* ' Stable Economy,' 1840. 



