2 



Dr. J. S. Lombard. Conduction of Heat in [Jan. 7, 



sliding arm of a stand. The inferior surface of the copper plate was 

 brought in contact with water of a temperature lower than that of the 

 air by fractions of a degree of centigrade, as in the former experiments 

 referred to. 



Experiments on Muscle. 

 The muscles examined were those of the head, thigh, and leg of the 

 sheep. 



It soon was noticed that the rate of transmission differed somewhat, 

 according as the muscle was examined in the direction of its fibres or 

 perpendicularly to them ; and this fact led to the division of the 

 experiments into two classes, according as the line of conduction 

 was parallel or at right angles to that of the fibres. 



Tables I and II give results obtained under these two conditions 

 respectively. The results represent 104 observations on conduction 

 parallel to tbe direction of the fibres, and 100 observations on conduc- 

 tion at right angles to this direction. 



Table I. — Conduction of Heat through 10 mm. of Sheep's Muscle, 



parallel to the direction of the Fibres. 



Time. 



Percentages of heat transmitted. 



Averages. 



Maxima. 



Minima. 



9 „ 



Permanent thermal condition . . . 



33-985391 

 51 -215703 

 66-775211 

 82 -730123 



58 -359600 

 77 -219200 

 93 -108500 

 99 -500000 



19 -959500 

 34-712200 

 49-133700 

 63-557000 



Table II. — Conduction of Heat through 10 mm. of Sheep's Muscle, 

 perpendicular to the direction of the Fibres. 



Time. 



Percentages of he?t transmitted. 



Averages. 



Maxima. 



Minima. 



6 „ 



9 



Permanent thermal condition . . . 



27-038177 

 40 -701253 

 58 -174220 

 76 -614920 



40-837000 

 60-789900 

 84-384200 

 99 -422300 



11-373300 

 26 -283600 

 39 -203600 

 50-911200 



It will be seen that parallel conduction shows the higher per- 



