521 



was specially dried before moulding it. Biyi gave an abnormally 

 high temperature-coefficient at liigiier temperatures and even after 

 36 hours' heating had not yet attained a constant resistance. 



The metastable condition which according to Professor E. Cohen 

 is peculiar of most metals as mixtures of different moditications 

 manifested itself also in onr experiments. The plates after being 

 heated in the electric furnace to fiO° or 100° C. showed some dif- 

 ference as regards resistance and HALL-effect after cooling, with the 

 further peculiarity, that this change took place, altiiough no change 

 in the specific gravity affecting the second decimal place could be 

 established. 



The results are contained in tables I and II. 



TABLE I. 



TABLE IL 



