1908-9.] On the Recalescence Temperatures of Nickel. 67 
Now, the range of temperature over which I have found heat is given 
out at the greatest rate, viz. the latter part of the large recalescence, is from 
370°-285°, and this corresponds very well with the ranges given for the 
changes noted above, by Harrison. 
My conclusion, then, is that nickel (98 per cent.) in cooling from 900° to 180° 
gives out heat gradually over a long range (roughly speaking, from about 
700° to about 285°), but in addition there are three places where heat is 
given out at a greater rate. We have recalescences of small extent at 
about 660° and at about 525°, and to a much larger extent from 440° to 
370°, and again to a larger extent from 370° to 285°. Also the range over 
which we have greatest evolution of heat corresponds to that range over 
which we have the well-known changes in the magnetic and thermo-electric 
properties of nickel occurring. 
I hope to repeat these experiments with a purer specimen of nickel, to 
determine whether or not the recalescences observed occur in the nickel 
itself or are due to impurities. 
The expenses of this research were defrayed in part by a grant from the 
Tait Memorial Fund. 
(. Issued separately December 22 , 1908 .) 
