E. 8. Simpson— Latente in Western Australia. 405 



to the presence of organic compounds of iron. In this connexion it 

 IS worth noting that a series of small springs flowing out from beneath 



Map of Western Australia, showing localities where laterite has been observed, 



and referred to in Mr. E. S. Simpson's paper, 

 the laterite at Mundaring gives rise to a stream which, near the 

 laterite, was found (in 1909) to contain ferrous iron (1-32 grains 



