Chap. 4.] Fixed Air may fa procured. 387 



pable of containing an ounce and half meafure. This 

 he filled with wine, plunging it into a vefiH of water. 

 The whole was then put over a fire, and the water in 

 which the phial was plunged fuffered to boil. The end 

 of the tube in the itopple being placed under the 

 mouth of an inverted receiver, filled with quickfilver, 

 the heat expelled the fixed air from the wine, which; 

 entering into the receiver, afcended in bubbles through 

 the quickfilver to the top, removing in its pafTage a 

 part of the metal, and afiuming its place in the receiver. 

 The refult of the Doctor's experiment may be inte- 

 refting to fome readers, and to others it may at leaft 

 afford entertainment. 



1 - oz. of Madeira produced T i- of an oz. meaf. of fked air. 

 Port 6 years old - ? ' T 

 Hock of 5 years - -^ 

 Barrelled Claret - T L 

 Tockay of 16 years ^ 

 Champagne of z years - 2 oz. meafures. 

 Bottled Cyder of 12 years 3 f 



"Fixed air may be eafily obtained by mixing together 

 equal parts of brown fugar and good yeafl of beer, and 

 adding about twice the quantity of water. This mix- 

 ture being put into a phial, to which a bent tube with 

 a cork or ftopple may be adapted* will immediately 

 ferment, and yield a confiderable quantity of fixed air, 

 which may be received into a phial filled with quick- 

 filver or water. 



adly. Fixed air is produced by the refpiration of 

 animals ; in which cafe the oxygen of the air infpired 

 furni fives part of its heat to the fupport of life, and 

 combines with the carbonaceous or coaly matter, 

 which is difengaged from the blood in the lungs. 



3dly. From what has been previoufly ftated it is evi- 

 dent, that fixed air may be produced by thfc combuf- 

 |ion of any carbonaceous or coally matter. 



C c 2 4tbly. 



