l III PH\ ill HI 1-7 



SITE OF ORIGIN OF THF BEAT 



The working hypothesis from which w< 

 problem is thai the beal orig in the ! t<> 



[»ul this to the ■■ irious methods have 1 1 \\ 



or < ling "i- injuring tin- node and nol 



Such procedu eatly affi 



produce no change when applied i«» other pari I »■ 



termination of tin comparative rhythmic i" 



diflfere the auricular walls. II I in tl 



from the region of the i n »< l.-. Determination 



ometric <• u r\ es of the relal ion of tl 



impulse 1 1 nil t h. ^<- methods the resull 



in the sinoauricular node, bu1 on 

 tance in connection \\ ith the ii 

 man. it is particularly with the resull of the third 

 that \\ >• w ill concern «>ir 



Evidence Furnished by Studying the Current of Action Which 



Accompanies the Heartbeat 



start with, it is .-ssriitial that w >- ma ith 



nethods employed Th< 

 follov s w | en a • ction p 



mediately preceded by a change in electrical pol 

 detected bj means • 1\ anometi I with 1 



ailed nonpolarizable electro I 



and must nol \ ibl 



to p i nerallj in use toda; 



Einthovi n. h <\ from 1 1 



ployed in physical laboratories in that tin 

 through a foil of w in 

 Bilverized quartz thread ^i^ i in tl 



.■xists between tin- two opp 

 The Btring is thus surrounded on all • j innui 



ending betv e< n tin- tun: v. 



small, p tring, it wi 



OM n. ami tli. - ith tl 



W ill cans.- the 

 st i ■ light, ami i* 



ted on .i mo\ in _ 

 suitable holdi I 

 in plac< 



