140 Agbiotjltdbal Expbkiment Statiok, Ithaca, N. T. 



The left horn of calf No. 4 was somewhat sensitive to the touch, but 

 appeared to be perfectly healthy. As most of the horns treated were 

 not affected by the reagents it was thought best to give them another 

 treatment and by so doing to try still other chemical reagents; accord- 

 ingly the following chemicals were applied: 



Calf No. 2, — Right horn, chloride of mercury and hydrochloric acid. 



Calf No. 3. — Right horn, caustic potash. 

 Left horn, caustic potash. 



Calf No. 4. — Right horn, chloride of mercury and hj^drochl'c acid. 

 Left horn, chloride of mercury and sulphuric acid. 



Calf No. 5. — Right horn, chloride of mercury and hydrochl'c acid. 

 Left horn, chloride of mercury and sulphuric acid. 



The caustic potash applied to calf No. 3 was not so concentrated nor 

 so much applied as to calf No. 1 in the first trial. 



An examination of all the calves Feb. 14, 1892, showed the condi- 

 tions to be as follows: 



Calf No. 1. — Both horns destroyed. 



Calf No, 2. — Right horn not affected. 

 Left horn destroyed. 



Calf No. 3. — Right horn not affected. 

 Left horn not affected. 



Calf No. 4. — Right horn not affected. 

 Left horn destroyed. 



Calf No. 5. — Right horn not affected. , 



Left horn not affected. 



It will be seen that the second application desti'oyed the growth of 

 only one horn, the left horn of calf No. 4, and from the action of the 

 different reagents on the calves of different ages it seemed evident 

 that .chemicals, to be effective in preventing the growth of horns and 

 not make serious sores, must be applied early in the life of the 

 animal. 



As caustic potash had proved the most effectual in these trials, it 

 was used exclusively in succeeding experiments. Since the above 

 experiments were made the growth of the horns on seven other calves 

 have been successfully prevented by a single application of caustic 

 potash to each horn, hut in no case was the application made when the 

 calves loere more than one month old. Illustrations I, 2 and 3 show 

 the appearances of the heads after treatment with the various chemical 



