324 Mr. G. Gore on the Thermo-electric [Feb. 23, 



Table IV. 



i. 



Rapid- 

 ity of 

 pulse. 



II. 



Length of 

 pulse-beat, 

 in parts of 

 a minute. 



III. 



Length of 

 first cardiac 

 interval, in 

 parts of a 

 minute. 



IV. 



Length of 

 first arterial 

 interval, in 

 parts of a 

 minute* 



V. 



Length of 

 first cardio- 

 artenal in- 

 terval, in 

 parts of a 

 minute. 



- 



VI. 



Length of 

 conjugate 

 cardio-arte- 

 rial interval, 

 in parts of a 

 minute. 

 - 



VII. 



Length of 

 second car- 

 dio-arterial 

 interval, in 



parts of a 

 minute. 



36 



- 



•027 







•0083033 



•006428 



•0042735 



•0040298 







•00239821 



49 



.020408 



•00714286 



•005813 



•003663 



•00347986 



•00233342 



64 



•015625 



•00625 



•005319 



•003205 



•0030449 



•00227425 







uuo 



■nnj.ni q.^a 









100 



01 



•005 



•0046234 



•0025641 



•0024359 



•00218745 



121 



•0082645 



•0045 



•004299 



•002331 



•00221445 



•0020847 



144 



•00694 



•00416 



•0040486 



•0021365 



•0020301 



•0020185 



169 



•005917 



•003346 



•0038485 



0019704 



•0018756 



•0019729 



la conclusion, the following are the results that have been arrived at by 

 the use of the above cardio-sphygmograph : — 



1 . The first cardio-arterial interval varies inversely as the square root of 

 the pulse-rate. 



2. The conjugate cardio-arterial interval varies inversely as the square 

 root of the pulse-rate. 



3. The second cardio-arterial interval varies very little with different 

 pulse-rates, but is slightly longer in slower pulses. 



4. The depth of the notch in the first arterial interval of the sphygmo- 

 graph trace occurs at the moment of closure of the aortic valve. 



5. There is no definite indication in the sphygmograph trace of the 

 moment at which the arterial systole commences. 



II. " On the Thermo-electric Action of Metals and Liquids." 

 By George Gore, F.R.S. Received January 13, 1871. 



It is well known that the degree of rapidity with which a metal immersed 

 in an acid, alkaline, or saline liquid is corroded varies considerably with 

 the temperature, and that the speed of corrosion usually increases with the 

 heat ; also a few experiments have been published (Gmelin's ' Handbook 

 of Chemistry,' vol. i. p. 3/5) showing that changes of electrical state 

 occur in metals under such circumstances ; but a further examination of 

 the relations of the temperature and chemical change to the electrical state 

 has not, that I am aware, yet been made. 



In an investigation on the development of electric currents by unequally 

 heated metals in liquids (Phil. Mag. 1857, vol. xiii. p. 1), I found that hot 



