January, 1842.] 145 



the temperature of the bar is between five and six hundred degrees 

 of Fahrenheit, the magnetism is not only marked at the time, but 

 is in a great degree permanent. Samples were stated to have been 

 examined, which had been broken for several years, and to be 

 still in the same magnetic state in which they were at the moment 

 of fracture. 



In order to prove what part of the effect in the foregoing in- 

 stances, was due to the earth's magnetic influence, the proving 

 machine which produced ihe fracture, was changed in position, so 

 as to place the bar, in proving, directly across the magnetic meri- 

 dian, instead of coinciding with it as before. In this case no po- 

 larity was observed, whether the bars were broken cold or hot, 

 except some slight indications in a direction across the breadth of 

 the bar at the point of fracture. 



MEETING FOR BUSINESS. 



January 25th, 1842. 



Vice President Morton in the Chair. 



Reports of Committees. The Committee to whom was 

 referred Mr. S. S. Haldeman's paper on two new species of 

 the genus Perca, reported in favour of publication in the 

 Journal. 



The committee on Mr. Conrad's memoir on new species of 

 Silurian and Devonian fossils, with geological observations, 

 and a second memoir on the Contemporaneousness of the 

 Middle Cretaceous strata of the United States with the Faxoe 

 limestone of Europe, reported in favour of publication in the 

 Journal. 



The Corresponding Secretary's report was also read and 

 adopted. 



