550 



Mr. Seibei Konno on the Variation of 



Thus the thermal conductivity of tin, lead, zinc, and 

 aluminium rapidly decreases with the rise of temperature. 

 At the melting-points a discontinuous decrease of the con- 

 ductivity is observed, after which they diminish slightly. 



Fte. 5. 











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!00 -100 100 ZOO 300 400 500 600 700 800 900 1000 C. 



These changes of conductivity are similar to those of the 

 electric conductivity, as observed by Mr. H. Tsutsumi. For 

 the. sake of comparison, his results are reproduced in 

 figs. 5 and G with dotted curves. In order to see whether 



