1878.] 



the Temperature of the Head. 



171 



ture of the blood of the superficial vessels comes to affect the thermo- 

 meter, as well as the temperature of the deeper seated parts. 



Sir W. Thomson's galvanometer, and one devised by the writer 

 himself, already described several years ago, were employed.* The 

 rheostat and keys have also been described in 1868. f 



We will now proceed to examine the different spaces of the anterior 

 region. 



1st. Comparison of symmetrically situated spaces of the two sides of the 

 head, 100 observations on each pair of spaces. 



The first fact of importance demonstrated by this examination is, 

 that in no one of the spaces into which the anterior region is subdivided 

 is the temperature uniformly higher on one side than on the other : on the 

 contrary, it may be higher on the right side or on the left side in turn. 

 We have, therefore, to consider only on which side of the head in the 

 majority of cases the higher temperature is found in a given pair of 

 spaces. The following is the general distribution of temperature : — 



In favour of 

 Left side. Might side. 



1st Tier. 1st Tier. 



Districts — 1st, 2nd, 3rd. Districts — 4th, 5th. 



2nd Tier. 

 1st, 2nd, 3rd. 



3rd Tier. 

 1st, 2nd, 3rd. 



2nd Tier 

 4th, 5th. 



3rd Tier 

 4th, 5th. 



Mh Tier. 

 1st, 2nd, 3rd, 4th, 5th. 



hth Tier. 

 1st, 2nd, 3rd, 4th. 



6th Tier. 

 1st, 2nd, 3rd. 



Thus in the 27 spaces a side compared, the average relative tempera- 

 ture is higher on the right side than on the left in 18 spaces, or two- 

 thirds of the whole number. 



Next, taking the total number of observations, 2700, and deducting 



* " British Medical Journal," January 23, 1875. 

 f " Archives de Physiologie," July — August, 1868. 

 VOL. XXVII. N 



