ON SOME BLOWPIPE-REACTIONS. 257 



1. Platinum and Tin unite witli violent deflagration and emission 

 of light, forming a hard, brittle, and infusible globule. 



2. Platinum, Zinc and Tin unite with violent action, the zinc 

 thi'owing off long flakes of oxide. 



3. Platinum and Zinc, per se, do not combine, the zinc burning 

 into oxide. 



4. Platinum and Lead unite quietly, forming a brittle globule. 



5. Platinum and Thallium unite quietly; the resulting globule is 

 dark externally, gray internally, and quite brittle. 



G. Platinum and Bismuth unite quietly, or Avith merely slight 

 spitting, into a dark brittle globule. 



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 some- 

 what in excess) a yellow malleable globule. 



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



11. Gold and Zinc do not combine 2:»er se; the zinc bums into oxide. 



12. Gold and Lead combine quietly, forming a gray brittle bead. 



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

 extent during cooling. The globule may thus fr-equently be flattened 

 out, but not without cracking at the sides. If the metals remain 

 united, the button is dark blackish-gray, 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, malleable. 



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 wall become yellow from the silver 



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