168 M. R. KING 



JMoNCKEBKKd, .1. (I. IIUIS rutci-sucliuiificn uImm' (las Ati-io-vcntikularbundel 

 im inciischliclicu llcrzen. (luwlav riscliei', Jena. 



Retzer, Robert 1904 Uebcr die muskulose Verl)indiing zwischcn Vorhof und 

 Ventrikol das Saugeticrherzcns. Arch. f. Anat. u. Phys., Anat. Ab. 



Retzer, Robert 190S The anatomy of the conductive system in the mamma- 

 lian heart. Johns Hopkins' Hospital Bulletin, vol. 19. 



Tawara, S. 1906 Das Reizleitungssystem des Satigetierherzcns. Gustav 

 Fisher. Jena. 



WiLSOx, J. GoRDOx 1909 The nerves of the atrio-vciit ricuhir 1)undle. Anal 

 Rec, vol. 3. 



PLATE 1 



EXTLAXATIOX* OF FICTRES 



(Please view first four figuies with reading glass) 



1 Beef Heart No. 71. A retouchetl photograph showing the interior of the 

 left ventricle. The injection shows tlie left bianch of the bundle emci-ging from 

 the subaortic musculatui'e and branching into its terminal netwoik ov(M' the walls 

 of the ventricle. The left crus and the region of the ajiex extending up to the 

 point of branching of the left crus and as far as the pai)illary nniscles on either 

 side was injected from the right cms within the right ventricle. The regions 

 above the papillary muscles on the septal wall and under the cusps of the l)i- 

 cuspid valves were injected from the four points as marked in the figure by the 

 small white rings. 



2 Beef Heart Xo. GS. Interior of tln' left ventricle showing ilistribution of 

 the S. V. S. around the ])apillary muscles and over the |)()sterioi' ventricular wall. 

 The ventricle was opened by an incision through the wall extending fi-om the 

 aortic orifice to tire apex. Part of the right ventricle and moileratoi- band is 

 shown on the right. The left sejjtal bi-andi of (lie S. \'. S. is divided longitudi- 

 nally by the incision. 



