AND ITS RELATION TO ANIMAL LIFE 93 



in the same manner. This applies to artificial 

 infection at late Bile Station. 



" Breed of cattle, bastard Herefords. 

 " Yours faithfully, 

 " (Signed) R. W. F. STEYN." 



What appears to me to be the reason for this 

 immunity is that on this farm there were 

 mineral springs containing iron, and it was 

 from these springs that the animals drank 

 their water. Consequently, there would have 

 been a higher percentage of iron in the blood 

 of these animals. 



And to show that animals require iron, I have 

 seen mules licking rusty iron, just as thousands 

 of people have seen horses licking salt. 



The following cutting from the New York 

 Herald is interesting collateral evidence, 

 especially taken in conjunction with the fact, 

 which I have referred to on page 126, that sugar 

 extracts iron from the soil. 



" EATING RAILWAY IRON 



'* Iron for the blood has evidently been pre- 

 scribed for the quails of Florida ; at least, 

 these birds are eating steel rails on the tracks 



