( 228 ) 



5 25 30.950 ("14]. Three bulbs Qoat in the meniscus. 



A disturbance in the regulation of the temperature of the 

 outer bath put a stop to the experiment. 



July 11"' 1906. 



A third experiment did not give any difference with the 

 first with slow heating. The temperature was kept still closer 

 to the critical, and the heating went still more slowly. Now 

 the meniscus descended, and the brown colour under the 

 meniscus was particularly pronounced, it was darkest just 

 below the meniscus, and gradually faded downward. After 

 a slow heating which extended over 10 l / a hours the menis- 

 cus disappeared at 



6 h 30°.986. The position of the bulbs was now 



0.443 between 34 and 35 

 0.450 in the middle 27 

 0.466 between 25 and 26. 

 In consequence of a slight disturbance in the regulation 

 of the outer bath t[ descended to 



6 45 30.984 [25] the meniscus appears, the position of 



the highest bulb does not undergo any 

 change, the two others 0.450 and 0.466 

 float in the meniscus. 



9 15 3J.010 the meniscus disappeared somewhat lower, 



the brown colour in the lower half is much more intense, 

 at last it contracted to a dark brown band of ± 1 mM. 

 width just below the meniscus. Gradually it grew lighter 

 and shortly after the meniscus it also disappeared ; 

 0.443 between 41 and 42 



0.450 23 and 24 



0.466 in the middle 22. 

 The temperature at the top of the tube was D .0i higher 

 than at the bottom. 



§ 8. Conclusions and remarks. An elaborate discussion of the ob- 

 servations in connection with other peculiarities of the net of isotherms 

 in the neighbourhood of the critical state (cf. Comm. n". 74 and 

 Comm. n°. 88 IV § 5, Jan. 1904 and Comm. Suppl. n°. 10), and as 

 to those on the mist in connection with the observations of Gouy, 



