Chemistry. — ''On 'in Indirect Ana/i/sis- of Gas- Hydrates hy <t 

 T/iennody?('innc Method (rnd its ApplicatioiL to tltc Hydrate 

 of Sulphuretted Hydroyen". II. By Pi'ol". F. K. C. Scheffer 

 and G. Mkykh '). (Ooinmniiicated by Prof. Böeskkkn.) 



(Communicated in the meeting of March 29, 1919). 

 7. Deternihiation of the Hirer- l^hnsr Lines S.Sji G and SLji. 



A miinhei' of apparatus of llie shape, of lig'. 3 wa.s supplied with 

 sinali (piaiitities of water, which were inlrochiced ihioiigh (' and 

 c'oiiyeyed to the widened pai-t A by tilting (lie a[)paratiis. These 

 quantities of water weie chosen so that the ve.ssel A was filled with 

 whaler for about a fifth [)art. Every apparatus was tlien in succes- 

 sion connected with a sulphuretted hydrogen apparatus in which 

 the gas could be developed by the addition of drops of diluted 

 sulphuric acid to a solution of acid sodiinn sulj)hide. The latter was 

 obtained by saturating a solution of sodium hydroxide made free 

 from carbonic acid with barite with sulphuretted hydrogen. 



Befoie the prepaiation of the gas the wall of B and 6'. which 

 was still damp with water, was dried by being heated at an air- 

 pressure of 2 cm. of mercury, the bulb A being placed in carbonic 

 acid and alcohol. Between the filling-apparatus and the apparatus 

 (' a 7'-piece was inserted for this purpose, which made connection 

 with a waterjet pump possible. Then bulb A was filled for about 

 two thirds with di-y liquid sulphuretted hydrogen (the gas was led 

 through a ^/-tube with P^O^ to prevent liquid from being carried 

 along), after which the tube was fused to at 6', and the cooling 

 mixture was removed. 



When the temperature was raised to room-temperature, the ice 

 melted, and two layers were observed separated by a crust of sul- 

 phuretted hydrogen hydrate. In order to convert the mass as much 

 as possible to hydrate, bulb .4 was carefully heated by immersion 

 in a waterbath of over 30° (the quadruple point SL^LJr lies at 

 29.5° ■■')), till the hard crust had disappeared. Then the apparatus 



1) First communication, These Proc. 21. 1204. (1919). 

 •^) These Proc. 13. 84.S. 1911;. Table. 



