Prof. E. J. Chapman on some Blowpipe Reactions. 465 



7. Platinum and Copper combine quietly, though not very 

 readily, into a hard, light-coloured, malleable globule. 



8. Platinum and Silver unite quietly, but not very readily 

 unless the silver be greatly in excess, into a white malleable 

 globule. 



9. Platinum and Gold unite quietly, forming (if the gold 

 be somewhat in excess) a yellow malleable globule. 



10. Gold and Tin unite quietly into a very brittle globule. 



11. Grold and Zinc do not combine per se ; the zinc burns 

 into oxide. 



12. Gold and Lead combine quietly, forming a grey brittle 

 bead. 



13. Gold and Thallium unite quietly, but separate again to 

 some extent during cooling. The globule may thus frequently 

 be flattened out, but not without cracking at the sides. If 

 the metals remain united, the button is dark blackish grey and 

 quite brittle. 



14. Gold and Bismuth unite quietly and readily, forming 

 a very brittle globule. 



15. Gold and Copper, and 16. Gold and Silver, unite and 

 form a malleable globule. 



17. Silver and Tin unite quietly into a malleable globule. 



18. Silver and Lead unite readily into a malleable globule. 



19. Silver and Thallium combine readily; globule mal- 

 leable. 



20. Silver and Bismuth unite readily and quietly : the 

 globule is brittle, but admits of being slightly flattened out. 



21. Silver and Copper, and 22. Silver and Gold, form 

 malleable globules. The gold alloy, even with gold largely 

 in excess, is quite white. If it be flattened out and heated 

 in a platinum spoon with some bisulphate of potash, it will 

 become yellow from the silver on the surface being dissolved. 

 On remelting the flattened disk, a silver-white globule is 

 again obtained. 



23. Copper and Tin unite into a grey and partially mal- 

 leable bead, the surface of which, in the oxidizing flame, 

 becomes more or less thickly incrusted with cauliflower-like 

 excrescences of oxide. 



24. Copper and Zinc do not unite per se into a globule, the 

 zinc burning into oxide. Under carbonate of soda, or carbo- 

 nate of soda and borax, brass is readily formed. 



25. Copper and Lead form a dark-grey globule, which is 

 sufficiently malleable to admit of being extended on the anvil. 



26. Copper and Thallium melt into a dark-grey malleable 

 globule. 



27. Lead and Tin unite readily ; but the globule commences 

 Phil Mag. S. 5. Vol. 2. No. 13. Dec. 1876. 2 H 



