( 226 ) 



moving taster than the descending ones, and the velocity 

 of the rising bulbs increasing as they get higher, the same 

 thing taking place though in a smaller degree with the 

 descending ones. 

 2 h 15 .'51.032 the meniscus has gradually got fainter and 



is hardly to be distinguished, only a slight constriction of 

 the light band is to be perceived at 35. 

 2 20 31.036 0.421 between 42 and 43 



0.443 „ 36 and 37 

 0.450 „ 34 and 35 

 0.466 „ 32 and 33 

 2 50 31.22 the outer bath is further kept at this temperature 

 2 50 31.050 the rise of the temperature of the inner bath 



is now exceedingly regular 

 4 30 31.096 0.443 in the middle of 53 



0.450 between 32 and 33 

 0.466 „ 24 and 25 

 The mist in the tube is now equally dense everywhere, 

 and becomes gradually less, the moving apart of the three 

 still descending' bulbs continues slowly and regularly 

 8 7 31.210 0.466 lies just on the bottom 



0.450 between 36 and 37 ; has risen 

 4 mm in 2'T5' and so shows a 

 tendency to move to the top. 

 8 10 The cooling takes place by reducing the outer bath to a 



lower temperature 

 8 30 31.133 0.466 begins to rise from the bottom 



0.450 at the same place 

 8 35 Throughout the tube a bluish mist appears 

 8 40 This mist gets denser 



8 50 At [15] a thick milky white mist is formed, 



which spreads rapidly upwards and downwards. 



30.984 At [10] the meniscus appears. From the 

 upper place of contact of the thermo-elements drops fall 

 down, from the lower place of contact smaller gas bubbles 

 rise upwards. (The cooling proceeds too rapidly). The meniscus 

 rises, 3 bulbs fall quickly into it from above, and 1 rises 

 towards it from the bottom. 



The diiferences of temperature within the tube were found - 

 to be between 0°.02 and .03, but in consequence of dis- 

 turbances they were often not to be observed. In the obser- 

 vation of 8''7 they were no more than 3 .01. 



