ing slightly the gas-tube D. About 40 cubic centimeters of 

 concentrated, boiled hydrochloric acid are afterwards added to it 

 in the same way. As soon as the liquid in the flask A is again 

 boiling, the stream of carbon dioxid is shut off and allowed to 

 flow again only towards the end of the operation, when the con- 

 tents of the flask are reduced almost to dryness. As will be 

 seen from the above directions, no unboiled liquids of any kind 

 are to be used as reagents in the apparatus described. If the 



Fig. 25. De Konnick's Apparatus. 



flask A were made much smaller the efficiency of this apparatus 

 would be increased. It appears to have few, if any, advantages 

 over Warington's process. 



355. De Konnick's Modification of Schloesing's Method. This 

 modification consists in an arrangement of the gas delivery tube, 

 whereby the regurgitation of the water in the measuring burette 

 into the evolution flask is prevented by a device for sealing the 



