POTENT WORM-DESTROYERS. 341 



should a case be encountered in which the symptoms of 

 worms persist after one of the vermifuges recommended 

 has been given, then it will be advisable to administer the 

 others, allowing always an interval of a week between 

 each. As, for instance, give mixture No. 2 the first week, 

 areca nut the second, and male fern the third. And this 

 course pursued, the work of ejectment ought to be com- 

 plete, each agent finding its own special victims. 



But puppies having passed the first year and acquired a 

 resistance to the unpleasant effects of such drugs, were 

 it necessary the entire battery could be turned loose at 

 one and the same time — that is, if in any instance the 

 symptoms of worms did not disappear after each one of 

 the vermifuges advised had been used in turn they might 

 all be given together, in a single dose. 



Nor is it likely that this single dose would do any harm 

 were it made up of full doses of all the ingredients, but no 

 risks should be taken with a good dog, therefore it would 

 be advisable in every instance to give in the combined 

 dose only two-thirds of a dose of each. In other words, it 

 would be necessary to consider the age of the dog to be 

 treated and estimate according to the rules already laid 

 down the quantities of areca nut, male fern and mixture 

 No. 2 suitable for him, and then take of each only two- 

 thirds. 



To preclude all possibility of error the writer will go 

 further and assume that the reader has a collie about four- 

 teen months old which presents symptoms of worms that 

 have resisted all the mixtures advised, the same having 

 been given singly, and he now desires to try them to- 

 gether. Turning back to the different preparations it is 

 found that for dogs of this age the following doses were 

 recommended : — 



Of No. 2, two doses of three teaspoonfuls each, or six 



