304 



HEART FIELD OPERATION 



GRAPER, L. , lyu7 - 'Unter^uchungen uber die Herzbildung der Vogel" . Arch. 1. Ent. Mech. 24:375. 



HECRE, E. S. , 1945 - "Intracardiac transplantation in the urodele. " Science. 101:469. 



HILTON, W. A. , 1913 - "The development of the blood and transformation of some of the early vitelline vessels in Amphibia. " 

 Jour. Morph. 24:339. 



KEMP, N. E. , 1953 - "Morphogenesis and metabolism of amphibian larvae after excision of the heart. " Anat. Rec. 117:405 G 773. 



KNOWER, J. M. , 1907 - "Effects of early removal of the heart and arrest of the circulation on the development of frog embryos. " 

 Anat. Rec. 1:161. 



LEHMANN, F. E. , 1929 - "Die Entwicklung des Anlagenmusters in Ektoderm der Tritongastrula. " Arch. f. Ent. Mech. 117:317. 



LILJESTRAND, A., J. E. EDW.ARDS, 1957 - "X-ray irradiation of pregnant rats: attempts to produc ^ cardiac anomalies in off- 

 spring. " Proc. Soc. Exp. Biol. G Med. 94:111-112. 



MANGOLD, O. , 1921 - "Situs inversus bei Triton. " Arch. f. Ent. Mech. 48:505. 



PIATT, ]., A. RAVENTOS, 1953 - "Transplantation of irradiated tissues of embr/onic Amblystoma. " Snat. Rec. 115:409. 



REEMSTMA, K. , W. M. COPENHAVER, 1958 - "Anatomic studies of the cardiac conduction system in congenital malformations 

 of the heart." Circulation. 17:271-276. 



SCHUBEL, K. , J. P. STOHR, 1924 - "Ein Beitrage zur Pharmokologie Transplanttatierten Amphibienherzcn. " Arch. f. Exper. 

 Path. u. Pharmac. 104: 



SPEMANN, H. , H. FALKENBERG, 1919 - "Uber asymmetrische Entwicklung und Situs inversus viscerum bei Zwillingen und Dop- 

 pelbildungen". Arch. f. Ent. Mech. 45:371. 



STOHR, J. P., 1929 - "Zur Embryonalen Henentransplantation. " Arch. f. Ent. Mech. 116:300. 



STAGE 26 



ECTO 



STAGE 30 



STAGE 34 



MYOCARDIUM 



ENDOCARDIUM 



(From Copenhaven, Van Dyke, and Rugh 1960) 



Cardiac differentiation in embryos of Amblystoma punctatum at Harrison's 

 developmental stages selected for x -irradiation. Vertical lines beneath the 

 stage 26 and stage 30 embryos indicate the plane of the cross sections shown 

 at the right. 



