- On the transmission 



In the courie of the procefs, the finery chider that was 

 formed had united to the earth of the tube, and made a 

 hole through it, but I colledled 8 dwts. of the iron which 

 had not been niuch affecled. 



V/lth copper in the fame procefs I got pretty pure 

 dephlogifticated air, from the acid only, while the pro- 

 dudion was rapid, but when it came flowly, it was ni- 

 trous. The copper was covered with a peculiar kind of 

 fcale, and fome parts were entirely reduced to it. It 

 was brittle, but not black. 



Sending the fame vapour over 240 grains of perfect char- 

 coal^ 1 got, with prodigious rapidity, and full of black 

 fmoke, 900 ounce meafures of air, (lightly inflammable, 

 without any fixed air. It was of the fame fpecific gravity 

 with common air, and what remained of the charcoal 

 weighed 47 grains. 



From about an ounce of the charcoal of l?o?ies, out of 

 which all air had been expelled by heat, I got, by the 

 tranfmilTion of the fame vapour, about an hundred ounce 

 meafures of air, of which one-fifth was fixed air, and the 

 reft phlogifticated. Continuing the procefs, the air that 

 came afterwards was dephlogifticated, from the acid only. 



From a quantity of melted lead I got, in the fame pro- 

 cefs, air that came with great rapidity, at firft dephlogifti- 

 cated from the acid, afterwards, what was worl'e than 

 common air, as it cxtinguifhed a candle. After the 

 procefs 1 found in the earthen tube much glafs of lead 

 covered in part with a white powdery fubftance, which 

 was, no doubt, nitrated calx of lead. 



The experiment with liu in this procefs was fimilar to 

 that with lead. After the procefs there was found a 

 quantity of a white fubftance in hard lumps, and the tin 

 that remained was covered with it. This was, no doubt, 

 the nitrated calx of tin. 



When this procefs was gone through with bifmuth the air 

 produced was exceedingly turbid, and ftrongly nitrous. But 



the 



