244 OZENA. 



III. — Neither must it be understood, that one or other of 

 them are certain at all times to cure Ozena. In numerous 

 instances every one of the remedies named may fail. 



TV. — The extent to which each of the remedies may 

 require to be used is also a matter of great uncertainty. 

 Sometimes a few doses will cure, as though by magic ; while, 

 in other cases of a like nature, the system requires, as it 

 were, to be saturated with the drug before the desired result 

 is obtained: so that much, in every case, will necessarily 

 depend upon the constitutional peculiarities of the patient. 



Dose. — The dose in which each drug may be given will 

 depend upon the size and the breed of the patient. If the 

 animal be a large-sized, heavy, draught horse, the Iodide of 

 Iron, the Sulphate of Copper, or the Sulphate of Iron, may 

 each be given in doses varying from 2 to 4 drachms, and 

 repeated once or twice a day, according to the urgency of the 

 case. The Biniodide of Copper will require greater caution in 

 its exhibition ; a 2-drachm dose given once a day, or a drachm 

 dose twice a day, will suffice in the generality of cases. Each 

 dose of the latter should be given in half a pint of cold water. 

 The other remedies may either be given in balls, or mixed with 

 water. 



Teephiitikg, akd Stringing. — Cases of Ozena, when of 

 recent origin, may not require to be operated upon. If the 

 case, however, has become chronic, and internal remedies of a 

 proper nature have been resorted to without success, the opera- 

 tions of Trephining and Syringing should be resorted to at 

 once. The most direct mode of syringing the top part of the 

 nasal cavity is to trephine into the frontal sinus (see/, Fi^. 18). 



