258 ON SOME BLOWPIPE-REACTIONS. 



on the surface being dissolved. On re-melting tlie flattened disc, a 

 silver-white globule is again obtained. 



23. Copper and Tin unite into a gray and partially malleable bead, 

 the surface of which, in the O. F., becomes more or less thickly 

 encrusted with cauliflower-like excrescences of oxide. 



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

 burning into oxide. Under carb.-soda, or carb.-soda and borax, brass 

 is readily formed. 



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

 malleable to admit of being extended on the anvil. 



26. Copper and Thallium melt into a dark-gray malleable globule. 



27. Lead and Tin unite readily, but the globule commences imme- 

 diately to oxidize, throwing out excrescences of white and yellow oxide. 

 On removal from the flame, it still continues in ignition, and pushes 

 out further excrescences. The unoxidized internal portion (if any 

 remain) is malleable. 



28. Lead and Bismuth unite readily: the molten globule acquires 

 a thin dark coating of oxide on the surface only, and admits of being 

 flattened out, more or less, upon the anvil. 



29. Lead and Thallium form a malleable globule. 



30. Bismuth and Tin unite readily, biit the fused mass immedi- 

 ately throws out excrescences, and becomes covered with a dense crust 

 of oxides. The reaction, however, it not so striking as with lead and 

 tin. 



31. Thallium and Tin exhibit the same reaction as lead and tin, 

 but the cauliflower-like excrescences are brownish-black. 



