192 ANNUAL EECORD OF SCIENCE AND INDUSTRY. 



additional burners. To avoid the glare, the light was in- 

 closed in a globe of ground glass. Hevue Industrielle^YW., 

 May, 1876, 169. 



MAGNETISM OF COBALT AND NICKEL. 



It has longr been known that a bar of iron when masfnetized 

 becomes appreciably elongated. Barrett has recently sought 

 to discover whether cobalt and nickel are similarly aflected. 

 With cobalt, a slight lengthening may be perceived ; but in 

 the case of nickel a contraction, about equal to the expansion 

 of iron, takes place. The bar of nickel used was about two 

 feet long. 1 A, June 30. 



