1882.] On the Propagation of Heat by Conduction, Sec. 173 



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" Experimental Researches on the Propagation of Heat by 

 Conduction in Bone, Brain-tissue, and Skin." By J. S. 

 Lombard, M.D., formerly Assistant Professor of Physiology 

 in Harvard University. Communicated by Dr. Brown- 

 Sequard, F.R.S. Received October 1. Read November 

 17, 1881. 



Introduction. 



The question of the precise degree of the conductivity for heat of 

 the tissues lying between the surface of the brain and the outer sur- 

 face of the integument is, of course, of the first importance in study- 

 ing the possible effects on the exterior of the skin of changes of 

 temperature occurring in the superficial layers of the cerebrum ; and 

 the question of the degree of conductivity of brain- tissue itself is of 

 great importance with reference to the extent to which propagation 

 through the cerebral mass of thermal changes occurring in a single 

 point or tract of the brain may take place. 



