, Bi 



tliis point changes by a change in the previous thermal history of 

 the metal. 



2. The sample the transition point of which had been fixed at 

 71°. 7 (§ 6 of our tirst paper) had not been treated with an electrolyte. 

 It was removed from the dilatometer, washed with ether and kept 

 in contact for some days with a solution of copper sulphate. This 

 material (Cu^j) then gave tlie following results: 



TABLE I. 



Temperature. 



Duration of 



measurements in 



hours 



Rise of level 

 in mm. 



Rise of level 

 in mm. 

 per hour 



61.7 

 74.6 

 69.6 

 72.1 

 70.3 

 71.6 

 70.8 

 70.6 

 70.7 



'/6 



Ve 

 1 



2/3 



% 

 l'/6 

 5'/6 



— 78 

 +225 



- 38 

 -t- 67 



— 38 

 + 84 

 + 13'/ 



- 10 

 + 36 



+ 



The transition point has thus been altered from 7J°.7 to 70°. 65. 



3. As far as the measurements we carried out with samj)les of 

 very dilFerent previous thermal history are concerned, we only 

 mention here that we found as upper limit of the transition tem- 

 perature 71^^.7, as lower one 69 .2. ^) 



4. We merely give here some details concerning a sample (Cum) 

 which had been made by mixing a certain weight of Cun (Transi- 

 tion point 70^.65) with an equal quantity of the original matei'ial 

 (Kupfer-KAHLBAUM, Elektrolyt, geraspelt), which as we were told 

 when purchasing it, had l)een melted after electrolysis. Cum had 

 been at 50° for 10 days and nights in contact with paraffin oil. 

 The results are given in table II. 



1) The description of our experiments will be given in full in our paper in the 

 Zeilschr. f. physik. Chem. 



