ON GOLD-ALUMINIUM ALLOYS. 



231 



the experiments ; Professor EWING and Mr. ROSENHAIN for their kindness in advising 

 us concerning the photomicrography, and for the loan of apparatus ; and Messrs. 

 JOHNSON and MATTHEY for twice lending us considerable amounts of gold. 



Much of the apparatus had been purchased at various times out of grants made by 

 the Royal Society, and some by means of a grant made to us at the Dover meeting of 

 the British Association. 



GOLD-ALUMINIUM ALLOYS. 

 INDEX TO PLATE 4. 



