DETERMINATION OF AGE BY THE HORNS. 



183 



roughness of these series of scaly sections vary from year to year, 

 and indicate the years until the horns cease to grow, — at four. 

 Observations by Girard on the growth of the horns of merino 

 rams (the horns of the merinos are the most typical) showed the 

 growth to be : — 



The first j'ear, 

 The second year, 

 The third year, 

 The fourth year, 



19 to 20 inches. 

 5 to 6 " 

 3 to 4 " 

 2 to 3 " 



29 33 " 



Fig. 169a. 

 a. Merino ram ; b, Montenegrin ram ; c, goat. 



