446 



temperature. Tlie behaviour of Tl-VlU confirms the experience gained 

 with /7>-\vire8 (Comra. N'. ]33r/ §15), that joints in a wire do not 

 affect its becoming super-conducting. The unsteadiness of the resistance 

 at 2°. 33 K. is caused by the pressure variations of the bath over 

 a range of 0.6 m.m. Hg, corresponding to 0.006 of a degree; 



