313 Apparatus fur inaking Gascons Oxide of Carhofi. 



of uniting with them, chemists were obliged to employ 

 targe vessels difficult to be managed, and so inconvenient 

 that it was even impossible to collect those tiuids with cer- 

 tainty, the greater part of which ^^ere suffered to escape 

 through the openino- found necessary in practice to prevent 

 a rupture of the vessels. 



At present, v^ith the apparatus of Woulf, we experience 

 none of those inconveniences : the operations carried on 

 during the disengagement of the gas can be made in ves- 

 sels of very small capacity ; we can divide the gases, and 

 determine their quantity and quality very precisely : in fine, 

 such an operation as was formerly very dangerous to the 

 conductor, can now be continued for hours without risk or 

 trouble. 



To these advantages many others have been added ; and 

 all the world knows that they are owing to that perfection 

 to which chemists have brought the apparatus of Woulf j 

 and, above all, to the happy application which has been 

 made of such apparatuses in a number of circumstances. 



But although discoveries of this kind have been carried 

 very far, it is probable that a great number more are yet in 

 reserve ; and much praise is due to those who make exer- 

 tions for this in)portant object, since the apparatuses which 

 they contrive are so many new means jiut into the hands of 

 chemists to collect an infinity of products, which often 

 escape, and of which the knowledge might have an im- 

 portant effect on the perfecting of chemical science. 



From such views, I have thought it would be useful to 

 announce an apparatus invented by M. Baruel, lecturer in 

 the School of iVledicine in Paris. This young chemist, per- 

 ceiving the difficulties and risks that are run in certain pro- 

 cesses in which gases are liberated, or when it is necessary 

 to present them for combination to different substances, has 

 endeavoured to obviate the difficulties, and, after several 

 attempts, has produced an apparatus the utility of which 

 has far exceeded his hopes. 



I have seen this apparatus employed with great success 

 in the production of (jaseous oxide of carbon. This gas, 

 which before could only be obtained with difficulty, and 

 but in small quantities, may now be procured with great 

 ilacility and with little expense. 



The same apparatus mav also be used for the preparation 

 ef sulphurized hydrogen gas, carbonized and phosphorized 

 hvdrcgen gas ; and may be employed with equal advantage 

 for saturating substances widi any gas, especially when the 

 saturation can only be made at a high temperature. 



I shall 



