PHILOSOPHICAL SOCIETY OF WASHINGTON. 3t3 



Mr. Nicholson referred to experiments conducted by him in 

 1861 under the direction of Mr. Henry on the six metre bar of 

 the Coast Survey for determining its expansion by heat, and a 

 series commenced, but not completed, for determining the effect 

 of magnetism on metallic bars, showing a decided effect. 



Mr. Elliott spoke of the interest he manifested in the higher 

 applications of mathematics especially to electricity, and the 

 wish on his part to promote the branches of science, with which 

 he did not profess to be completely familiar. 



' Messrs. Antisell, Parker, and Farquhar spoke of the en- 

 couragement and assistance afforded by Mr. Henry to young 

 men in the prosecution of scientific researches. 



