AND ITS RELATION TO ANIMAL LIFE 135 



iron ; a solution of this salt prevents the con- 

 nidia from germinating." 



Anthracnose, another fungoid disease, in 

 the same work 



" As a preventative to its attacks a solution 

 of 50 per cent, of iron sulphate has been very 

 useful." 



We here find iron inimical to the growth of 

 certain specified fungi, and no doubt further 

 experiment would indefinitely enlarge the list. 

 Now, I have shown conclusively that iron is 

 a main ingredient of chlorophyll, hence we 

 have further evidence, if it were needed, that 

 a plant containing a normal chlorophyll will 

 afford a most unhealthy soil for the growth of 

 fungi, and if unhealthy to the growth of fungi 

 in plant life, there can be no reason why the 

 presence of iron should not retard or abso- 

 lutely prevent the growth of fungi, otherwise 

 bacteria, in animal life when taken in by the 

 food. 



NITROGEN AND FATS 



Scientific American Supplement, February 9, 



