320 



DISEASES DUE TO HELMINTHS 



This oil has a disagreeable flavour and is expensive. 



In any of these methods three repeated treatments may be necessary, 

 in which cases allow an interval of four to seven days. 



In some cases it is difficult to clear out all the worms even with the 

 repeated courses. 



The ana?mia should be treated on general lines. 



Iron, grains 30 or more should be given daily. 



Reduced iron, ferric perchloride, ferrous sulphate, iron carbonate 

 (Blaud), and the ammonia citrate are useful in the order named. 



Arsenic and digitalis can also be given. 



Points of Difference between the Ankylostome duodenale and 



THE Negator americanus. 



A. duodenale 



The worm is thicker and longer 

 The bend of the neck is slow 

 The mouth capsule is large and thick 

 The oesophagus is long and tubular 

 The teeth are small and shallow, with a 



large brownish pear-shaped hook 

 There are two separate spicules in the 



male 

 The dorsal ray of the bursa has three 



prongs 



N. americanus 



The worm is thinner and shorter 



The neck bend is sharp 



The mouth capsule is small and thin 



The oesophagus is bent and bulbed 



The teeth are large pointed, spheroidal and 



colourless 

 There is one spicule in the male 



The dorsal ray of the bursa has two prongs 



Table indicating briefly the Mode of Infection by Helminths. 



(After Daniels.) 



