Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIV. No. 1. — August, 1898. 



ON THE THERMAL CONDUCTIVITIES OF CERTAIN 

 POOR CONDUCTORS. — I. 



By B. O. Peirce and R. W. Willson. 



Investigations on Light and Heat, made and published wholly or in part with Appropriation 



FROM the KUMFORD FOND. 



MARINE BIOLOGICAL LABORATORY. 



Received %lJ^.,..I^.X^R'^.. 



Accession No. 1^. itzf- 



Given by 0^rroy^Ji^L^:^C^.,0Ln^r^.^.9r:^: 



Place, 



