140 FIVKK. 



A plniisiblr explanation of this fall is to be found in the supposition tliat in those 

 instances the wDuntlsof the brain were sufficiently near the llitziy's region to irritato 

 it. In order to detmnine wlicthir such irritation would diminish heat ])rodu('tion, 

 two experiments were ])crlormed. A properly located oprninj,' was made in the 

 skull of the doj; bv a In-phine, and the brain mend)ranes carefully dissected off: the 

 orifice was then filled with salt, which was held in its place by a pledget of lint, 

 over which the scali) wound was closed by sewing. The experiments are as 

 follows : — 



Exi'KKIMENT 5)(>. 

 A dog. Wiight 2-2 pounds. Il:i0 a. m. — llcctnl tiiiipcraturc loa".."). 



12:4.^ r. .M. — TtiituI liiiiiicraliin' >0:2°.."). 1 i-. m. — I'niiii exposril. !:.'>.'> r. m — I)ry ^!l!t ]iiil on 

 IIitzif;'8 region 



:» 1'. M. — Itcclul tcniptriiluro 1()2\4. 



t I-. M — lloitnl tonijiorntnro lO'J'.r,. 



AutopKij. — The regions sallud oonipri.spd the fir.^t and second convoluiions of eacli licnii.>!pherB 

 for loiuc distance on butli side:) of tliu sulcus cruciutus; arachnoid mucli injected. 



llxtt Dism'jxtlUm, 

 nEFriar. IniiiTATioM. 



(jaantity of air (V) = 112 nl 72.9.r — 320 = 40.93 = t'. 



V + ( V X t' X 0.002035) = V. V = '^- = 103.4. W = V x 0.08073 = 8.35 



1.083 



Fall in temp, of air 0.39 = 1. Q = W x t X fp. Ii. =■ 8.35 x 0.39 x 0.2374 = 0.7731 -^ heat Ukcn from a r. 



Ri»c in Ump. of water 1.08 x 1.30.s:>s9 = 141..3276 = hoat given to calorimeter. 



0.7731 Bs heat taken from air. 



Ileal dim'pated iii cine hour 140.5545 



