again into a dilatonieter wliicli was heated tor 24 iioiirs at 145°, 

 then for 24 iiours at 270° (tliat is only 50 degrees helow the melting 

 point of the metal). 



We only succeeded in "bringing it into motion" by heating it for 

 48 hours at 50° in a solution of cadmium sulphate. 



We then got the following results (Table II) : 



TABLE II. 



The transition point has been changed to 63°. 4. 



7. In this wa}^ we carried out a gi'eat many experiments with 

 samples of different previous thei-mal history ^). The extreme limits 

 which were found for this (apparent) transition temperature were 

 69°.3 and 61°.3. 



8. As it is almost impossible to lix the real transition point 

 of the pure modifications in this way, we tried to prepare a sharply 

 defined modification of cadmium avoiding high temperatures. F'or 

 this purpose we electrolyzed an ammoniacal solution of cadmium 

 sulphate between an electrode of platinum and one of pure cadmium. 

 (40 Volt, 20 — 25 Ampère ; surface of the electrodes 26 cm'.). 



We kept the temperature of the solution below 40°, cooling the 

 vessel with ice. The solution was kept homogeneous by a glass-stirrer 

 (Witt), which was kept in motion by a small motor. The cadn)ium 

 which was formed at the electrode was washed with dilute sulphu?*ic 

 acid, then with water, alcohol, and ether. After this it was dried at 40°. 



170 grams of this material were put into a dilatometer. As it is 

 very finely divided, great care must be taken in order to remove the 

 air from the dilatometer. We used a GAEDK-pump for the |)urpose. 



^) The details will be given in lull in our paper in the Zeilschrifl f. physik. Gheui. 



