485 



In conclusion I offer my hearty thanks to Prof. Kamerlingh Onnes 

 for the interest which he has taken in my work. 



Chemistry. — ''The Allotropy of Cadmium J' I. By Prof. Ernst 

 Cohen and W. D. Helderman. 



'i. In a paper which will be published in the Zeitschrift fur phy sik. 

 Chemie one of us (C.) proved in collaboration with Mr. A. ' L. Th. 

 Moesveld, tiiat bismuth is capable of existing in more than one 

 allotropic modification and that there is a transition temperature at 

 75° of the enantiotropic transformation 



75° 

 Bismuth a ^ Bismuth /?. 



In that paper we mention that we had found in a publication 

 of Matthiessen and von Bose'j (on the electric conductivity of metals, 

 published in 1862) certain indications which justified the presumption 

 that oilier metals which till now are only known in one modification 

 would show the same behaviour as bismuth (and tin). The following 

 clauses may be quoted from Matthiessen and von Bose's paper as 

 referring specially to the metal cadmium : 



"Die nach mehrtagigem Erhitzen auf 100° erhaltenen Verander- 

 ungen in der Leitungsfahigkeit der Driihte, sind unglücklicher 

 Weise verloren gegangen. Es mag bemerkt werden, dass die 

 Veriinderungen sehr gering waren und dass eine Abnahme in der 



1) Poggendorff's Ann. 115, 353 (1862). 



