Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIV. Xo. 11 —February, 1S99. 



ON THE THERMAL CONDUCTIVITY OF CAST IRON. 



By E. H. Hall and C. H. Ayres. 



With Two Plates. 



Investigations on Light and IIeat, made and pdhlished wholly or in part with Appropriation 



FROM the RUMFORD Fu.ND. 



