Rocks of the Howqua River, 65 



Acknowledgements. 



I have previously referred to willing help and criticism afforded 

 by Professor Skeats, who has now come to the rescue at the eleventh 

 hour by kindly offering to deal with the petrological description of 

 the more typical forms of diabase. This work was postponed 

 pending the completion of chemical analyses by the author, but the 

 necessity of leaving at short notice for West Africa would have 

 meant leaving this section in a very incomplete form had it not 

 been for this friendly offer. I am also greatly indebted to my 

 father for constant companionship in the field, where the roughness 

 and inaccessibility of the country would have added considerably 

 to the difficulty of the work had it been necessary to do it alone. 



Bibliography. 



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(2) Gregory, J. W. — Tlie Heathcotian, a Pre-Ordovician Series 

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(8) Howitt, A. W. — " Notes on Diabase and Adjacent Forma- 

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(9) Graham, R. P. 0. — Origin of Massive Serpentine and 

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(I 



