146 CHAPTER 17. 



288. Aloes in solution. 



Aloes in the solid form contains a resinous principle, and hence is 

 sometimes excreted by the kidneys. In making the solution the resinous 

 matter rises to the top, and may easily be skimmed off. Hence the solu- 

 tion becomes a purer medicine, and may preferably be given in some 

 cases, where the admixture of resin contained in the solid form would be 

 injurious. Its action is also quicker. 



The solution is made by dissolving four or five drachms of aloes in a 

 pint of hot water, with two drachms of powdered ginger and an ounce of 

 aromatic spirits of ammonia; or half the above quantity may be dis- 

 solved, and half a pint of linseed oil added with two drachms of powdered 

 ginger. The drench should be well shaken before being given. 



Practically, however, there is always an objection to giving drenches 

 to the horse when it can be avoided, because an uncertain proportion of 

 the medicine is usually spilt and lost in the administration. 



The action of Aloes, whether in the solid or liquid form, may be in- 

 creased by combining it with gentian. Thus in lieu of five drachms, 

 four drachms of aloes may be given with two drachms of tincture of 

 gentian. 



289. Linseed oil 



Linseed oil taken internally is a purgative. It is less certain, as a 

 general rule, in its action than aloes ; but is preferred in some cases, 

 because it produces less irritation of the intestinal linings than aloes. 

 The dose is from 10 to 30 oz. 



289a. Croton Farina. 



Croton Farina is a very powerful, but dangerous purgative, and is only 

 given in extreme cases of constipation. It acts rapidly, and causes 

 watery evacuation. It is difficult to stop the purgation induced. It 

 sometimes causes inflammation of the intestines. The dose is from 20 

 to 30 grains. 



2896. Croton oil 



Croton oil is sometimes administered in cases of obstinate constipation 

 dependent on some functional derangements of the nervous system. 



The oil may be given in doses of 15 to 25 minims, either mixed with 

 linseed meal into a bolus, or with olive or linseed oil in a draught. In 

 cases where neither ball nor draught can be given, it may be placed upon 

 the tongue. 



Like Croton Farina, this oil is a powerful and dangerous purgative, 

 and should only be administered in extreme cases. 



