HEART F lELD OPERATIONS 311 



BEFERENCES : 



Bacon, B. L., 19'+5 - "Self-differentiation and induction in the heart of Amblyatoma. " 



Jour. Exp. Zool. 98:87. 

 Copenhaver, W. M., 1959 - "Some ohservationa on the growth and function of heteroplastic 



heart grafts." Jour. Exp. Zool. 82:259 (see ibid, 80:192). 

 Copenhaver, W. M., 19^+5 - "Heteroplastic transplantation of the sinus venosus between two 



species of Amblyatoma." Jour. Exp. Zool, 100:205. 

 Ekman, G. , I925 - "Experimentelle Beitrage zur Herzentwicklung der Amphibien." Arch. f. 



Ent. mech. 106:520. 

 Ekman, G. , I929 - "Experimentelle Untersuchungen uber die fruheste Herzentwicklung bei 



Bana fusca." Arch. f. Ent. mech. 116:52?. 

 Fales, D. E., 191+6 - "A study of double hearts produced experimentally in embryos of Ambly- 

 atoma punctatum. " Jour. Exp. Zool. 101:281. 

 Goerttler, K. , I928 - "Die Bedeutung der ventrolateralen Mesoderm-bezlrke fur die Herzen- 



lage der Amphibienkeime. " Anat. Anz. Erg. Heft. 66:152. 

 Goss, CM., 1955 - "Double hearts produced experimentally in rat embiyos." Jour. Exp. 



Zool. 72:55. 

 Graper. L., I907 - "Untersuchungen uber die Herzblldung der Vogel." Arch. f. Ent. mech. 



2i^:375. 

 Hegre, E. S., 19^+5 - "Intracardiac tranaplantatlon in the urodele." Science. 101:1+69. 

 Hilton, W. A., 1915 - "The development of the blood and the transformation of some of the 



early vitelline vessels in Amphibia." Jour. Morph. 2U:559. 

 Knower, J. McE., I907 - "Effects of early removal of the heart and arrest of the circula- 

 tion on the development of frog embryos." Anat. Bee. I:l6l. 

 Lehmann, F. E., I929 - "Die Entwicklung des Anlagenmusters in Ektoderm der Tritongastrula. " 



Arch. f. Ent. mech. 117:517. 

 Mangold, 0., I92I - "Situs inveraua bei Triton." Arch. f. Ent. mech. 1*8:505. 

 Schubel, K. & J. P. Stohr, I92I+ - "Ein Beitrage zur Pharmokologle transplanttatierten 



Amphibienherzen. " Arch. f. Exper. Path. u. Pharm. IOI+. 

 Spemann, H. & H. Ihlkenberg, I919 " "Uber asymmetriache Entwicklung und Situs Inversus 



viacerum bei Zwlllingen und Doppelbildungen. " Arch. f. Ent. mech. 14-5 :571. 

 Stohr, J. Ph., I92I+ - "Uber Explantation und Tranaplantatlon embryonaler Amphibienherzen." 



Die Naturwlss. 18. 

 Stohr, J. Ph., 1925 - "Experimentelle Studien an embryonalen Amphibienherzen. III. Uber 



die Entstehung der Herzf orm. " Arch. f. Ent. mech. 106:l+09. 

 Stohr, J. Ph., 1929 - "Zur Embryonalen Herztransplantation." Arch. f. Ent. mech. 116:500. 



"Meaning can only be introduced into our knowledge of 

 the ext e rnal univer se by the simultaneous prosecut ion of 

 research at all levels of complexity and organization, for 

 only in this way can we hope to under s tand how one is con- 

 nected with the others. " 



J. Needham 19i2 



Aristotle in his "De Partibus Animalium" maintained 

 that the essence of a living animal is found not in what it 

 is, or how it acts, but why it is as it is and acts as it 

 doe s . 



