136 SHEEP: BREEDS AND MANAGEMENT. 



of sheep in disease they are not likely to be falsified. It is also 

 right to take into account that sheep must of necessity be 

 treated collectively rather than individually. The best treat- 

 ment for 500 ewes may be known, but the peculiarities of the 

 digestive system, o r t^rvous system of each sheep cannot be 

 ascertained as it may be among cows and horses. The human 

 doctor studies the idiosyncrasies of each patient ; but when a 

 veterinary surgeon is called in to a flock of sheep he is obliged 

 to prescribe generally, and the constitutional differences of 

 individuals must tend to render the results of his treatment 

 conflicting and unreliable. 



